Hello,
syzbot found the following issue on:
HEAD commit: 2950c9c5e0df Linux 4.19.207
git tree: linux-4.19.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=137c754b300000
kernel config:
https://syzkaller.appspot.com/x/.config?x=8273060cfa230984
dashboard link:
https://syzkaller.appspot.com/bug?extid=6b7fc56a7391b8277521
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+6b7fc5...@syzkaller.appspotmail.com
loop5: p4 size
3657465856 extends beyond EOD, truncated
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
ieee802154 phy0 wpan0: encryption failed: -22
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff888052c5d6a0 by task kworker/1:6/31351
CPU: 1 PID: 31351 Comm: kworker/1:6 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events sco_sock_timeout
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
__lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
sco_sock_timeout+0x7b/0x1b0 net/bluetooth/sco.c:95
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Allocated by task 1421:
__do_kmalloc mm/slab.c:3727 [inline]
__kmalloc+0x15a/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466
sk_alloc+0x36/0xec0 net/core/sock.c:1520
sco_sock_alloc.constprop.0+0x31/0x200 net/bluetooth/sco.c:480
sco_sock_create+0xd5/0x180 net/bluetooth/sco.c:515
bt_sock_create+0x154/0x2a0 net/bluetooth/af_bluetooth.c:130
__sock_create+0x3d8/0x740 net/socket.c:1365
sock_create net/socket.c:1416 [inline]
__sys_socket+0xef/0x200 net/socket.c:1458
__do_sys_socket net/socket.c:1467 [inline]
__se_sys_socket net/socket.c:1465 [inline]
__x64_sys_socket+0x6f/0xb0 net/socket.c:1465
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 1424:
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
sk_prot_free net/core/sock.c:1503 [inline]
__sk_destruct+0x684/0x8a0 net/core/sock.c:1584
sk_destruct net/core/sock.c:1599 [inline]
__sk_free+0x165/0x3b0 net/core/sock.c:1610
sk_free+0x3b/0x50 net/core/sock.c:1621
sock_put include/net/sock.h:1711 [inline]
sco_sock_kill.part.0+0xaa/0xc0 net/bluetooth/sco.c:412
sco_sock_kill net/bluetooth/sco.c:404 [inline]
sco_sock_release+0x1a2/0x330 net/bluetooth/sco.c:1035
__sock_release+0xcd/0x2a0 net/socket.c:599
sock_close+0x15/0x20 net/socket.c:1214
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888052c5d600
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
2048-byte region [ffff888052c5d600, ffff888052c5de00)
The buggy address belongs to the page:
page:ffffea00014b1700 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0xffff888052c5cd80 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea000284e608 ffffea00016eab88 ffff88813bff0c40
raw: ffff888052c5cd80 ffff888052c5c500 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888052c5d580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888052c5d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888052c5d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888052c5d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888052c5d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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