WARNING: held lock freed in nr_release
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syzbot
Jul 17, 2019, 4:58:07 AM7/17/19
to da...@davemloft.net, linux...@vger.kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, ra...@linux-mips.org, syzkall...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 3eb51486 Merge tag 'arc-5.3-rc1' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=144104d0600000
kernel config: https://syzkaller.appspot.com/x/.config?x=1044f14a33f8bb44
dashboard link: https://syzkaller.appspot.com/bug?extid=a34e5f3d0300163f0c87
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=174ef948600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12475834600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a34e5f...@syzkaller.appspotmail.com
=========================
WARNING: held lock freed!
5.2.0+ #66 Not tainted
-------------------------
syz-executor290/9125 is freeing memory ffff8880936e02c0-ffff8880936e0abf,
with a lock still held there!
000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: lock_sock
include/net/sock.h:1522 [inline]
000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
net/netrom/af_netrom.c:522
2 locks held by syz-executor290/9125:
#0: 0000000027c540ab (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:778 [inline]
#0: 0000000027c540ab (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x89/0x280 net/socket.c:585
#1: 000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: lock_sock
include/net/sock.h:1522 [inline]
#1: 000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
net/netrom/af_netrom.c:522
stack backtrace:
CPU: 0 PID: 9125 Comm: syz-executor290 Not tainted 5.2.0+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_freed_lock_bug kernel/locking/lockdep.c:5185 [inline]
debug_check_no_locks_freed.cold+0x9d/0xa9 kernel/locking/lockdep.c:5218
kfree+0xec/0x2c0 mm/slab.c:3753
sk_prot_free net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 net/core/sock.c:1726
sk_destruct+0x86/0xa0 net/core/sock.c:1734
__sk_free+0xfb/0x360 net/core/sock.c:1745
sk_free+0x42/0x50 net/core/sock.c:1756
sock_put include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 net/socket.c:586
sock_close+0x1e/0x30 net/socket.c:1264
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x904/0x2eb0 kernel/exit.c:877
do_group_exit+0x135/0x370 kernel/exit.c:981
get_signal+0x48a/0x2510 kernel/signal.c:2728
do_signal+0x87/0x1670 arch/x86/kernel/signal.c:815
exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442609
Code: Bad RIP value.
RSP: 002b:00007ffc16869ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000442609
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000017e2c R08: 0000000000000003 R09: 0000000400000009
R10: 0000000400000009 R11: 0000000000000246 R12: 0000000000403440
R13: 00000000004034d0 R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: use-after-free in debug_spin_lock_before
kernel/locking/spinlock_debug.c:83 [inline]
BUG: KASAN: use-after-free in do_raw_spin_lock+0x28a/0x2e0
kernel/locking/spinlock_debug.c:112
Read of size 4 at addr ffff8880936e034c by task syz-executor290/9125
CPU: 0 PID: 9125 Comm: syz-executor290 Not tainted 5.2.0+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
kasan_report+0x12/0x20 mm/kasan/common.c:612
__asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
do_raw_spin_lock+0x28a/0x2e0 kernel/locking/spinlock_debug.c:112
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
_raw_spin_lock_bh+0x3b/0x50 kernel/locking/spinlock.c:175
spin_lock_bh include/linux/spinlock.h:343 [inline]
release_sock+0x20/0x1c0 net/core/sock.c:2932
nr_release+0x303/0x3e0 net/netrom/af_netrom.c:553
__sock_release+0xce/0x280 net/socket.c:586
sock_close+0x1e/0x30 net/socket.c:1264
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x904/0x2eb0 kernel/exit.c:877
do_group_exit+0x135/0x370 kernel/exit.c:981
get_signal+0x48a/0x2510 kernel/signal.c:2728
do_signal+0x87/0x1670 arch/x86/kernel/signal.c:815
exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442609
Code: Bad RIP value.
RSP: 002b:00007ffc16869ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000442609
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000017e2c R08: 0000000000000003 R09: 0000000400000009
R10: 0000000400000009 R11: 0000000000000246 R12: 0000000000403440
R13: 00000000004034d0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 9130:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc mm/kasan/common.c:487 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
__do_kmalloc mm/slab.c:3655 [inline]
__kmalloc+0x163/0x780 mm/slab.c:3664
kmalloc include/linux/slab.h:557 [inline]
sk_prot_alloc+0x23a/0x310 net/core/sock.c:1603
sk_alloc+0x39/0xf70 net/core/sock.c:1657
nr_make_new net/netrom/af_netrom.c:476 [inline]
nr_rx_frame+0x733/0x1e80 net/netrom/af_netrom.c:959
nr_loopback_timer+0x7b/0x170 net/netrom/nr_loopback.c:59
call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers kernel/time/timer.c:1685 [inline]
__run_timers kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
__do_softirq+0x262/0x98c kernel/softirq.c:292
Freed by task 9125:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
__cache_free mm/slab.c:3425 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3756
sk_prot_free net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 net/core/sock.c:1726
sk_destruct+0x86/0xa0 net/core/sock.c:1734
__sk_free+0xfb/0x360 net/core/sock.c:1745
sk_free+0x42/0x50 net/core/sock.c:1756
sock_put include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 net/socket.c:586
sock_close+0x1e/0x30 net/socket.c:1264
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x904/0x2eb0 kernel/exit.c:877
do_group_exit+0x135/0x370 kernel/exit.c:981
get_signal+0x48a/0x2510 kernel/signal.c:2728
do_signal+0x87/0x1670 arch/x86/kernel/signal.c:815
exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880936e02c0
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 140 bytes inside of
2048-byte region [ffff8880936e02c0, ffff8880936e0ac0)
The buggy address belongs to the page:
page:ffffea00024db800 refcount:1 mapcount:0 mapping:ffff8880aa400e00
index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000257f988 ffffea00024ef988 ffff8880aa400e00
raw: 0000000000000000 ffff8880936e02c0 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880936e0200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880936e0280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff8880936e0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880936e0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880936e0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: 3eb51486 Merge tag 'arc-5.3-rc1' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=144104d0600000
kernel config: https://syzkaller.appspot.com/x/.config?x=1044f14a33f8bb44
dashboard link: https://syzkaller.appspot.com/bug?extid=a34e5f3d0300163f0c87
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=174ef948600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12475834600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a34e5f...@syzkaller.appspotmail.com
=========================
WARNING: held lock freed!
5.2.0+ #66 Not tainted
-------------------------
syz-executor290/9125 is freeing memory ffff8880936e02c0-ffff8880936e0abf,
with a lock still held there!
000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: lock_sock
include/net/sock.h:1522 [inline]
000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
net/netrom/af_netrom.c:522
2 locks held by syz-executor290/9125:
#0: 0000000027c540ab (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
include/linux/fs.h:778 [inline]
#0: 0000000027c540ab (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x89/0x280 net/socket.c:585
#1: 000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: lock_sock
include/net/sock.h:1522 [inline]
#1: 000000005bf1c8ae (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
net/netrom/af_netrom.c:522
stack backtrace:
CPU: 0 PID: 9125 Comm: syz-executor290 Not tainted 5.2.0+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_freed_lock_bug kernel/locking/lockdep.c:5185 [inline]
debug_check_no_locks_freed.cold+0x9d/0xa9 kernel/locking/lockdep.c:5218
kfree+0xec/0x2c0 mm/slab.c:3753
sk_prot_free net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 net/core/sock.c:1726
sk_destruct+0x86/0xa0 net/core/sock.c:1734
__sk_free+0xfb/0x360 net/core/sock.c:1745
sk_free+0x42/0x50 net/core/sock.c:1756
sock_put include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 net/socket.c:586
sock_close+0x1e/0x30 net/socket.c:1264
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x904/0x2eb0 kernel/exit.c:877
do_group_exit+0x135/0x370 kernel/exit.c:981
get_signal+0x48a/0x2510 kernel/signal.c:2728
do_signal+0x87/0x1670 arch/x86/kernel/signal.c:815
exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442609
Code: Bad RIP value.
RSP: 002b:00007ffc16869ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000442609
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000017e2c R08: 0000000000000003 R09: 0000000400000009
R10: 0000000400000009 R11: 0000000000000246 R12: 0000000000403440
R13: 00000000004034d0 R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: use-after-free in debug_spin_lock_before
kernel/locking/spinlock_debug.c:83 [inline]
BUG: KASAN: use-after-free in do_raw_spin_lock+0x28a/0x2e0
kernel/locking/spinlock_debug.c:112
Read of size 4 at addr ffff8880936e034c by task syz-executor290/9125
CPU: 0 PID: 9125 Comm: syz-executor290 Not tainted 5.2.0+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
kasan_report+0x12/0x20 mm/kasan/common.c:612
__asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
do_raw_spin_lock+0x28a/0x2e0 kernel/locking/spinlock_debug.c:112
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
_raw_spin_lock_bh+0x3b/0x50 kernel/locking/spinlock.c:175
spin_lock_bh include/linux/spinlock.h:343 [inline]
release_sock+0x20/0x1c0 net/core/sock.c:2932
nr_release+0x303/0x3e0 net/netrom/af_netrom.c:553
__sock_release+0xce/0x280 net/socket.c:586
sock_close+0x1e/0x30 net/socket.c:1264
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x904/0x2eb0 kernel/exit.c:877
do_group_exit+0x135/0x370 kernel/exit.c:981
get_signal+0x48a/0x2510 kernel/signal.c:2728
do_signal+0x87/0x1670 arch/x86/kernel/signal.c:815
exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442609
Code: Bad RIP value.
RSP: 002b:00007ffc16869ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000442609
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000017e2c R08: 0000000000000003 R09: 0000000400000009
R10: 0000000400000009 R11: 0000000000000246 R12: 0000000000403440
R13: 00000000004034d0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 9130:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc mm/kasan/common.c:487 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
__do_kmalloc mm/slab.c:3655 [inline]
__kmalloc+0x163/0x780 mm/slab.c:3664
kmalloc include/linux/slab.h:557 [inline]
sk_prot_alloc+0x23a/0x310 net/core/sock.c:1603
sk_alloc+0x39/0xf70 net/core/sock.c:1657
nr_make_new net/netrom/af_netrom.c:476 [inline]
nr_rx_frame+0x733/0x1e80 net/netrom/af_netrom.c:959
nr_loopback_timer+0x7b/0x170 net/netrom/nr_loopback.c:59
call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers kernel/time/timer.c:1685 [inline]
__run_timers kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
__do_softirq+0x262/0x98c kernel/softirq.c:292
Freed by task 9125:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
__cache_free mm/slab.c:3425 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3756
sk_prot_free net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 net/core/sock.c:1726
sk_destruct+0x86/0xa0 net/core/sock.c:1734
__sk_free+0xfb/0x360 net/core/sock.c:1745
sk_free+0x42/0x50 net/core/sock.c:1756
sock_put include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 net/socket.c:586
sock_close+0x1e/0x30 net/socket.c:1264
__fput+0x2ff/0x890 fs/file_table.c:280
____fput+0x16/0x20 fs/file_table.c:313
task_work_run+0x145/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x904/0x2eb0 kernel/exit.c:877
do_group_exit+0x135/0x370 kernel/exit.c:981
get_signal+0x48a/0x2510 kernel/signal.c:2728
do_signal+0x87/0x1670 arch/x86/kernel/signal.c:815
exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880936e02c0
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 140 bytes inside of
2048-byte region [ffff8880936e02c0, ffff8880936e0ac0)
The buggy address belongs to the page:
page:ffffea00024db800 refcount:1 mapcount:0 mapping:ffff8880aa400e00
index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000257f988 ffffea00024ef988 ffff8880aa400e00
raw: 0000000000000000 ffff8880936e02c0 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880936e0200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880936e0280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff8880936e0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880936e0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880936e0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot
Jul 17, 2019, 6:05:01 AM7/17/19
to da...@davemloft.net, linux...@vger.kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, ra...@linux-mips.org, syzkall...@googlegroups.com, xiyou.w...@gmail.com
syzbot has bisected this bug to:
commit c8c8218ec5af5d2598381883acbefbf604e56b5e
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Thu Jun 27 21:30:58 2019 +0000
netrom: fix a memory leak in nr_rx_frame()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14022e8fa00000
start commit: a5b64700 fix: taprio: Change type of txtime-delay paramete..
git tree: net
final crash: https://syzkaller.appspot.com/x/report.txt?x=16022e8fa00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12022e8fa00000
kernel config: https://syzkaller.appspot.com/x/.config?x=87305c3ca9c25c70
dashboard link: https://syzkaller.appspot.com/bug?extid=a34e5f3d0300163f0c87
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1460b458600000
Reported-by: syzbot+a34e5f...@syzkaller.appspotmail.com
Fixes: c8c8218ec5af ("netrom: fix a memory leak in nr_rx_frame()")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit c8c8218ec5af5d2598381883acbefbf604e56b5e
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Thu Jun 27 21:30:58 2019 +0000
netrom: fix a memory leak in nr_rx_frame()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14022e8fa00000
start commit: a5b64700 fix: taprio: Change type of txtime-delay paramete..
git tree: net
final crash: https://syzkaller.appspot.com/x/report.txt?x=16022e8fa00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12022e8fa00000
kernel config: https://syzkaller.appspot.com/x/.config?x=87305c3ca9c25c70
dashboard link: https://syzkaller.appspot.com/bug?extid=a34e5f3d0300163f0c87
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1460b458600000
Reported-by: syzbot+a34e5f...@syzkaller.appspotmail.com
Fixes: c8c8218ec5af ("netrom: fix a memory leak in nr_rx_frame()")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot
Jul 18, 2019, 2:18:01 PM7/18/19
to syzkall...@googlegroups.com, xiyou.w...@gmail.com
Hello,
syzbot has tested the proposed patch but the reproducer still triggered
crash:
WARNING: held lock freed in nr_release
=========================
WARNING: held lock freed!
5.2.0+ #1 Not tainted
-------------------------
syz-executor.1/8694 is freeing memory ffff888097b9a2c0-ffff888097b9aabf,
/./include/net/sock.h:1522 [inline]
00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
/net/netrom/af_netrom.c:522
2 locks held by syz-executor.1/8694:
#0: 00000000839018f7 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
/./include/linux/fs.h:778 [inline]
#0: 00000000839018f7 (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x89/0x280 /net/socket.c:585
#1: 00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: lock_sock
/./include/net/sock.h:1522 [inline]
#1: 00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
/net/netrom/af_netrom.c:522
stack backtrace:
CPU: 0 PID: 8694 Comm: syz-executor.1 Not tainted 5.2.0+ #1
dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
print_freed_lock_bug /kernel/locking/lockdep.c:5185 [inline]
debug_check_no_locks_freed.cold+0x9d/0xa9 /kernel/locking/lockdep.c:5218
kfree+0xec/0x2c0 /mm/slab.c:3753
sk_prot_free /net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726
sk_destruct+0x86/0xa0 /net/core/sock.c:1734
__sk_free+0xfb/0x360 /net/core/sock.c:1745
sk_free+0x42/0x50 /net/core/sock.c:1756
sock_put /./include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 /net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 /net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 /net/socket.c:586
sock_close+0x1e/0x30 /net/socket.c:1264
__fput+0x2ff/0x890 /fs/file_table.c:280
____fput+0x16/0x20 /fs/file_table.c:313
task_work_run+0x145/0x1c0 /kernel/task_work.c:113
tracehook_notify_resume /./include/linux/tracehook.h:185 [inline]
exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163
prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath /arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffff44a21c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413501
RDX: 0000001b31720000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffff44a22a0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760e90 R15: ffffffffffffffff
Read of size 4 at addr ffff888097b9a34c by task syz-executor.1/8694
CPU: 0 PID: 8694 Comm: syz-executor.1 Not tainted 5.2.0+ #1
dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 /mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 /mm/kasan/report.c:482
kasan_report+0x12/0x20 /mm/kasan/common.c:612
__asan_report_load4_noabort+0x14/0x20 /mm/kasan/generic_report.c:131
debug_spin_lock_before /kernel/locking/spinlock_debug.c:83 [inline]
do_raw_spin_lock+0x28a/0x2e0 /kernel/locking/spinlock_debug.c:112
__raw_spin_lock_bh /./include/linux/spinlock_api_smp.h:136 [inline]
_raw_spin_lock_bh+0x3b/0x50 /kernel/locking/spinlock.c:175
spin_lock_bh /./include/linux/spinlock.h:343 [inline]
release_sock+0x20/0x1c0 /net/core/sock.c:2932
nr_release+0x303/0x3e0 /net/netrom/af_netrom.c:553
__sock_release+0xce/0x280 /net/socket.c:586
sock_close+0x1e/0x30 /net/socket.c:1264
__fput+0x2ff/0x890 /fs/file_table.c:280
____fput+0x16/0x20 /fs/file_table.c:313
task_work_run+0x145/0x1c0 /kernel/task_work.c:113
tracehook_notify_resume /./include/linux/tracehook.h:185 [inline]
exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163
prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath /arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffff44a21c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413501
RDX: 0000001b31720000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffff44a22a0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760e90 R15: ffffffffffffffff
Allocated by task 8677:
save_stack+0x23/0x90 /mm/kasan/common.c:69
set_track /mm/kasan/common.c:77 [inline]
__kasan_kmalloc /mm/kasan/common.c:487 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 /mm/kasan/common.c:460
kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501
__do_kmalloc /mm/slab.c:3655 [inline]
__kmalloc+0x163/0x780 /mm/slab.c:3664
kmalloc /./include/linux/slab.h:557 [inline]
sk_prot_alloc+0x23a/0x310 /net/core/sock.c:1603
sk_alloc+0x39/0xf70 /net/core/sock.c:1657
nr_make_new /net/netrom/af_netrom.c:476 [inline]
nr_rx_frame+0x73b/0x1ec0 /net/netrom/af_netrom.c:959
nr_loopback_timer+0x7b/0x170 /net/netrom/nr_loopback.c:59
call_timer_fn+0x1ac/0x780 /kernel/time/timer.c:1322
expire_timers /kernel/time/timer.c:1366 [inline]
__run_timers /kernel/time/timer.c:1685 [inline]
__run_timers /kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 /kernel/time/timer.c:1698
__do_softirq+0x262/0x98c /kernel/softirq.c:292
Freed by task 8694:
save_stack+0x23/0x90 /mm/kasan/common.c:69
set_track /mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 /mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457
__cache_free /mm/slab.c:3425 [inline]
kfree+0x10a/0x2c0 /mm/slab.c:3756
sk_prot_free /net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726
sk_destruct+0x86/0xa0 /net/core/sock.c:1734
__sk_free+0xfb/0x360 /net/core/sock.c:1745
sk_free+0x42/0x50 /net/core/sock.c:1756
sock_put /./include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 /net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 /net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 /net/socket.c:586
sock_close+0x1e/0x30 /net/socket.c:1264
__fput+0x2ff/0x890 /fs/file_table.c:280
____fput+0x16/0x20 /fs/file_table.c:313
task_work_run+0x145/0x1c0 /kernel/task_work.c:113
tracehook_notify_resume /./include/linux/tracehook.h:185 [inline]
exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163
prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath /arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888097b9a2c0
raw: 0000000000000000 ffff888097b9a2c0 0000000100000003 0000000000000000
ffff888097b9a280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff888097b9a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888097b9a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888097b9a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 9bb25d06 netrom: hold sock refcnt before sk_receive_queue
git tree: https://github.com/congwang/linux.git netrom
console output: https://syzkaller.appspot.com/x/log.txt?x=132e15a4600000
kernel config: https://syzkaller.appspot.com/x/.config?x=87305c3ca9c25c70
syzbot has tested the proposed patch but the reproducer still triggered
crash:
WARNING: held lock freed in nr_release
=========================
WARNING: held lock freed!
-------------------------
syz-executor.1/8694 is freeing memory ffff888097b9a2c0-ffff888097b9aabf,
with a lock still held there!
00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: lock_sock
/./include/net/sock.h:1522 [inline]
00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
/net/netrom/af_netrom.c:522
2 locks held by syz-executor.1/8694:
#0: 00000000839018f7 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock
/./include/linux/fs.h:778 [inline]
#0: 00000000839018f7 (&sb->s_type->i_mutex_key#12){+.+.}, at:
__sock_release+0x89/0x280 /net/socket.c:585
#1: 00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: lock_sock
/./include/net/sock.h:1522 [inline]
#1: 00000000fcc7216c (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0
/net/netrom/af_netrom.c:522
stack backtrace:
CPU: 0 PID: 8694 Comm: syz-executor.1 Not tainted 5.2.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack /lib/dump_stack.c:77 [inline]
Google 01/01/2011
Call Trace:
dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
print_freed_lock_bug /kernel/locking/lockdep.c:5185 [inline]
debug_check_no_locks_freed.cold+0x9d/0xa9 /kernel/locking/lockdep.c:5218
kfree+0xec/0x2c0 /mm/slab.c:3753
sk_prot_free /net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726
sk_destruct+0x86/0xa0 /net/core/sock.c:1734
__sk_free+0xfb/0x360 /net/core/sock.c:1745
sk_free+0x42/0x50 /net/core/sock.c:1756
sock_put /./include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 /net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 /net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 /net/socket.c:586
sock_close+0x1e/0x30 /net/socket.c:1264
__fput+0x2ff/0x890 /fs/file_table.c:280
____fput+0x16/0x20 /fs/file_table.c:313
task_work_run+0x145/0x1c0 /kernel/task_work.c:113
tracehook_notify_resume /./include/linux/tracehook.h:185 [inline]
exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163
prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath /arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffff44a21c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413501
RDX: 0000001b31720000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffff44a22a0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760e90 R15: ffffffffffffffff
==================================================================
BUG: KASAN: use-after-free in debug_spin_lock_before
/kernel/locking/spinlock_debug.c:83 [inline]
BUG: KASAN: use-after-free in debug_spin_lock_before
BUG: KASAN: use-after-free in do_raw_spin_lock+0x28a/0x2e0
/kernel/locking/spinlock_debug.c:112
Read of size 4 at addr ffff888097b9a34c by task syz-executor.1/8694
CPU: 0 PID: 8694 Comm: syz-executor.1 Not tainted 5.2.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack /lib/dump_stack.c:77 [inline]
Google 01/01/2011
Call Trace:
dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 /mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 /mm/kasan/report.c:482
kasan_report+0x12/0x20 /mm/kasan/common.c:612
__asan_report_load4_noabort+0x14/0x20 /mm/kasan/generic_report.c:131
debug_spin_lock_before /kernel/locking/spinlock_debug.c:83 [inline]
do_raw_spin_lock+0x28a/0x2e0 /kernel/locking/spinlock_debug.c:112
__raw_spin_lock_bh /./include/linux/spinlock_api_smp.h:136 [inline]
_raw_spin_lock_bh+0x3b/0x50 /kernel/locking/spinlock.c:175
spin_lock_bh /./include/linux/spinlock.h:343 [inline]
release_sock+0x20/0x1c0 /net/core/sock.c:2932
nr_release+0x303/0x3e0 /net/netrom/af_netrom.c:553
__sock_release+0xce/0x280 /net/socket.c:586
sock_close+0x1e/0x30 /net/socket.c:1264
__fput+0x2ff/0x890 /fs/file_table.c:280
____fput+0x16/0x20 /fs/file_table.c:313
task_work_run+0x145/0x1c0 /kernel/task_work.c:113
tracehook_notify_resume /./include/linux/tracehook.h:185 [inline]
exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163
prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath /arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffff44a21c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413501
RDX: 0000001b31720000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffff44a22a0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760e90 R15: ffffffffffffffff
Allocated by task 8677:
save_stack+0x23/0x90 /mm/kasan/common.c:69
set_track /mm/kasan/common.c:77 [inline]
__kasan_kmalloc /mm/kasan/common.c:487 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 /mm/kasan/common.c:460
kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501
__do_kmalloc /mm/slab.c:3655 [inline]
__kmalloc+0x163/0x780 /mm/slab.c:3664
kmalloc /./include/linux/slab.h:557 [inline]
sk_prot_alloc+0x23a/0x310 /net/core/sock.c:1603
sk_alloc+0x39/0xf70 /net/core/sock.c:1657
nr_make_new /net/netrom/af_netrom.c:476 [inline]
nr_rx_frame+0x73b/0x1ec0 /net/netrom/af_netrom.c:959
nr_loopback_timer+0x7b/0x170 /net/netrom/nr_loopback.c:59
call_timer_fn+0x1ac/0x780 /kernel/time/timer.c:1322
expire_timers /kernel/time/timer.c:1366 [inline]
__run_timers /kernel/time/timer.c:1685 [inline]
__run_timers /kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 /kernel/time/timer.c:1698
__do_softirq+0x262/0x98c /kernel/softirq.c:292
Freed by task 8694:
save_stack+0x23/0x90 /mm/kasan/common.c:69
set_track /mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 /mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457
__cache_free /mm/slab.c:3425 [inline]
kfree+0x10a/0x2c0 /mm/slab.c:3756
sk_prot_free /net/core/sock.c:1640 [inline]
__sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726
sk_destruct+0x86/0xa0 /net/core/sock.c:1734
__sk_free+0xfb/0x360 /net/core/sock.c:1745
sk_free+0x42/0x50 /net/core/sock.c:1756
sock_put /./include/net/sock.h:1725 [inline]
nr_destroy_socket+0x3ea/0x4b0 /net/netrom/af_netrom.c:288
nr_release+0x347/0x3e0 /net/netrom/af_netrom.c:530
__sock_release+0xce/0x280 /net/socket.c:586
sock_close+0x1e/0x30 /net/socket.c:1264
__fput+0x2ff/0x890 /fs/file_table.c:280
____fput+0x16/0x20 /fs/file_table.c:313
task_work_run+0x145/0x1c0 /kernel/task_work.c:113
tracehook_notify_resume /./include/linux/tracehook.h:185 [inline]
exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163
prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath /arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888097b9a2c0
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 140 bytes inside of
2048-byte region [ffff888097b9a2c0, ffff888097b9aac0)
The buggy address is located 140 bytes inside of
The buggy address belongs to the page:
page:ffffea00025ee680 refcount:1 mapcount:0 mapping:ffff8880aa400e00
index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00022ed708 ffffea00022d3e08 ffff8880aa400e00
flags: 0x1fffc0000010200(slab|head)
raw: 0000000000000000 ffff888097b9a2c0 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888097b9a200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
Memory state around the buggy address:
ffff888097b9a280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff888097b9a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888097b9a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888097b9a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 9bb25d06 netrom: hold sock refcnt before sk_receive_queue
git tree: https://github.com/congwang/linux.git netrom
console output: https://syzkaller.appspot.com/x/log.txt?x=132e15a4600000
kernel config: https://syzkaller.appspot.com/x/.config?x=87305c3ca9c25c70
syzbot
Jul 22, 2019, 8:14:01 PM7/22/19
to syzkall...@googlegroups.com, xiyou.w...@gmail.com
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger
crash:
Reported-and-tested-by:
syzbot+a34e5f...@syzkaller.appspotmail.com
Tested on:
commit: 0e39a78d fix
syzbot has tested the proposed patch and the reproducer did not trigger
crash:
Reported-and-tested-by:
syzbot+a34e5f...@syzkaller.appspotmail.com
Tested on:
commit: 0e39a78d fix
git tree: https://github.com/congwang/linux.git netrom
kernel config: https://syzkaller.appspot.com/x/.config?x=87305c3ca9c25c70
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Note: testing is done by a robot and is best-effort only.
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
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