[syzbot] KASAN: use-after-free Read in dump_schedule (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f5120f59 dpaa2-eth: don't print error from dpaa2_mac_conne..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1582989dd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7b1a53f9a0b5a801
dashboard link: https://syzkaller.appspot.com/bug?extid=a6e609c672ce997c14a8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11924417d00000

The issue was bisected to:

commit 7b9eba7ba0c1b24df42b70b62d154b284befbccf
Author: Leandro Dorileo <leandro.mac...@intel.com>
Date: Mon Apr 8 17:12:17 2019 +0000

net/sched: taprio: fix picos_per_byte miscalculation

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1261f09dd00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1161f09dd00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1661f09dd00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a6e609...@syzkaller.appspotmail.com
Fixes: 7b9eba7ba0c1 ("net/sched: taprio: fix picos_per_byte miscalculation")

==================================================================
BUG: KASAN: use-after-free in dump_schedule+0x758/0x7d0 net/sched/sch_taprio.c:1837
Read of size 8 at addr ffff888043cca140 by task syz-executor.5/9214

CPU: 1 PID: 9214 Comm: syz-executor.5 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233
__kasan_report mm/kasan/report.c:419 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436
dump_schedule+0x758/0x7d0 net/sched/sch_taprio.c:1837
taprio_dump+0x591/0xd80 net/sched/sch_taprio.c:1906
tc_fill_qdisc+0x60e/0x12a0 net/sched/sch_api.c:917
qdisc_notify.isra.0+0x2b1/0x310 net/sched/sch_api.c:984
tc_modify_qdisc+0xf54/0x1a50 net/sched/sch_api.c:1636
rtnetlink_rcv_msg+0x44e/0xb70 net/core/rtnetlink.c:5550
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fba2214b188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffcc845827f R14: 00007fba2214b300 R15: 0000000000022000

Allocated by task 9193:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
____kasan_kmalloc mm/kasan/common.c:507 [inline]
____kasan_kmalloc mm/kasan/common.c:466 [inline]
__kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:686 [inline]
taprio_change+0x5fb/0x4030 net/sched/sch_taprio.c:1477
qdisc_change net/sched/sch_api.c:1332 [inline]
tc_modify_qdisc+0xd50/0x1a50 net/sched/sch_api.c:1634
rtnetlink_rcv_msg+0x44e/0xb70 net/core/rtnetlink.c:5550
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 9201:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:212 [inline]
slab_free_hook mm/slub.c:1581 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1606
slab_free mm/slub.c:3166 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4225
rcu_do_batch kernel/rcu/tree.c:2558 [inline]
rcu_core+0x7ab/0x13b0 kernel/rcu/tree.c:2793
__do_softirq+0x29b/0x9f6 kernel/softirq.c:559

Last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
__call_rcu kernel/rcu/tree.c:3038 [inline]
call_rcu+0xb1/0x750 kernel/rcu/tree.c:3113
taprio_change+0x2e82/0x4030 net/sched/sch_taprio.c:1595
qdisc_change net/sched/sch_api.c:1332 [inline]
tc_modify_qdisc+0xd50/0x1a50 net/sched/sch_api.c:1634
rtnetlink_rcv_msg+0x44e/0xb70 net/core/rtnetlink.c:5550
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
__call_rcu kernel/rcu/tree.c:3038 [inline]
call_rcu+0xb1/0x750 kernel/rcu/tree.c:3113
taprio_change+0x2e82/0x4030 net/sched/sch_taprio.c:1595
qdisc_change net/sched/sch_api.c:1332 [inline]
tc_modify_qdisc+0xd50/0x1a50 net/sched/sch_api.c:1634
rtnetlink_rcv_msg+0x44e/0xb70 net/core/rtnetlink.c:5550
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888043cca100
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 64 bytes inside of
96-byte region [ffff888043cca100, ffff888043cca160)
The buggy address belongs to the page:
page:ffffea00010f3280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43cca
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000886b00 0000001600000016 ffff888011041780
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 8489, ts 1045116260415, free_ts 0
prep_new_page mm/page_alloc.c:2358 [inline]
get_page_from_freelist+0x1033/0x2b60 mm/page_alloc.c:3994
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5200
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
alloc_slab_page mm/slub.c:1644 [inline]
allocate_slab+0x2c5/0x4c0 mm/slub.c:1784
new_slab mm/slub.c:1847 [inline]
new_slab_objects mm/slub.c:2593 [inline]
___slab_alloc+0x44c/0x7a0 mm/slub.c:2756
__slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2796
slab_alloc_node mm/slub.c:2878 [inline]
slab_alloc mm/slub.c:2920 [inline]
__kmalloc+0x315/0x330 mm/slub.c:4063
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:686 [inline]
tomoyo_commit_ok+0x1e/0x90 security/tomoyo/memory.c:76
tomoyo_update_domain+0x5de/0x850 security/tomoyo/domain.c:139
tomoyo_update_path_number_acl security/tomoyo/file.c:691 [inline]
tomoyo_write_file+0x68b/0x7f0 security/tomoyo/file.c:1034
tomoyo_write_domain2+0x116/0x1d0 security/tomoyo/common.c:1152
tomoyo_add_entry security/tomoyo/common.c:2042 [inline]
tomoyo_supervisor+0xbc9/0xf00 security/tomoyo/common.c:2103
tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
tomoyo_path_number_perm+0x419/0x590 security/tomoyo/file.c:734
security_file_ioctl+0x50/0xb0 security/security.c:1539
__do_sys_ioctl fs/ioctl.c:1063 [inline]
__se_sys_ioctl fs/ioctl.c:1055 [inline]
__x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:1055
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
page_owner free stack trace missing

Memory state around the buggy address:
ffff888043cca000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
ffff888043cca080: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff888043cca100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888043cca180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888043cca200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: cf52ad5ff16c Merge tag 'driver-core-5.15-rc6' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1028c158b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6d3b157700b617b8
dashboard link: https://syzkaller.appspot.com/bug?extid=a6e609c672ce997c14a8
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e85344b00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1137bcaf300000

The issue was bisected to:

commit 7b9eba7ba0c1b24df42b70b62d154b284befbccf
Author: Leandro Dorileo <leandro.mac...@intel.com>
Date: Mon Apr 8 17:12:17 2019 +0000

net/sched: taprio: fix picos_per_byte miscalculation

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1261f09dd00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1161f09dd00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1661f09dd00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a6e609...@syzkaller.appspotmail.com
Fixes: 7b9eba7ba0c1 ("net/sched: taprio: fix picos_per_byte miscalculation")

==================================================================

BUG: KASAN: use-after-free in dump_schedule+0x79c/0x830 net/sched/sch_taprio.c:1841
Read of size 8 at addr ffff888079b90040 by task syz-executor038/30374

CPU: 1 PID: 30374 Comm: syz-executor038 Not tainted 5.15.0-rc5-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
dump_schedule+0x79c/0x830 net/sched/sch_taprio.c:1841
taprio_dump+0x53d/0xdf0 net/sched/sch_taprio.c:1910
tc_fill_qdisc+0x60e/0x12e0 net/sched/sch_api.c:923
qdisc_notify.isra.0+0x2b1/0x310 net/sched/sch_api.c:990
tc_modify_qdisc+0xf85/0x1a60 net/sched/sch_api.c:1642
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2510
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1935
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
sock_no_sendpage+0xf3/0x130 net/core/sock.c:2998
kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504
kernel_sendpage net/socket.c:3501 [inline]
sock_sendpage+0xe5/0x140 net/socket.c:1003
pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364
splice_from_pipe_feed fs/splice.c:418 [inline]
__splice_from_pipe+0x43e/0x8a0 fs/splice.c:562
splice_from_pipe fs/splice.c:597 [inline]
generic_splice_sendpage+0xd4/0x140 fs/splice.c:746
do_splice_from fs/splice.c:767 [inline]
do_splice+0xb7e/0x1960 fs/splice.c:1079
__do_splice+0x134/0x250 fs/splice.c:1144
__do_sys_splice fs/splice.c:1350 [inline]
__se_sys_splice fs/splice.c:1332 [inline]
__x64_sys_splice+0x198/0x250 fs/splice.c:1332
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f46c5794669
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff2ed06cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f46c5794669
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000010976 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff2ed06cf8
R13: 00007fff2ed06d30 R14: 00007fff2ed06d10 R15: 0000000000000e44

Allocated by task 30364:

kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]

set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa1/0xd0 mm/kasan/common.c:522
kasan_kmalloc include/linux/kasan.h:264 [inline]
kmem_cache_alloc_trace+0x1e4/0x480 mm/slab.c:3575
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
taprio_change+0x5fb/0x4160 net/sched/sch_taprio.c:1477
qdisc_change net/sched/sch_api.c:1338 [inline]
tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1640
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2510
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1935
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
sock_no_sendpage+0xf3/0x130 net/core/sock.c:2998
kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504
kernel_sendpage net/socket.c:3501 [inline]
sock_sendpage+0xe5/0x140 net/socket.c:1003
pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364
splice_from_pipe_feed fs/splice.c:418 [inline]
__splice_from_pipe+0x43e/0x8a0 fs/splice.c:562
splice_from_pipe fs/splice.c:597 [inline]
generic_splice_sendpage+0xd4/0x140 fs/splice.c:746
do_splice_from fs/splice.c:767 [inline]
do_splice+0xb7e/0x1960 fs/splice.c:1079
__do_splice+0x134/0x250 fs/splice.c:1144
__do_sys_splice fs/splice.c:1350 [inline]
__se_sys_splice fs/splice.c:1332 [inline]
__x64_sys_splice+0x198/0x250 fs/splice.c:1332
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 19:

kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46

kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
__cache_free mm/slab.c:3445 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3803
rcu_do_batch kernel/rcu/tree.c:2508 [inline]
rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2743
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558

Last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38

kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2987 [inline]
call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067
taprio_change+0x2fe5/0x4160 net/sched/sch_taprio.c:1597
qdisc_change net/sched/sch_api.c:1338 [inline]
tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1640
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2510
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1935
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
sock_no_sendpage+0xf3/0x130 net/core/sock.c:2998
kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504
kernel_sendpage net/socket.c:3501 [inline]
sock_sendpage+0xe5/0x140 net/socket.c:1003
pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364
splice_from_pipe_feed fs/splice.c:418 [inline]
__splice_from_pipe+0x43e/0x8a0 fs/splice.c:562
splice_from_pipe fs/splice.c:597 [inline]
generic_splice_sendpage+0xd4/0x140 fs/splice.c:746
do_splice_from fs/splice.c:767 [inline]
do_splice+0xb7e/0x1960 fs/splice.c:1079
__do_splice+0x134/0x250 fs/splice.c:1144
__do_sys_splice fs/splice.c:1350 [inline]
__se_sys_splice fs/splice.c:1332 [inline]
__x64_sys_splice+0x198/0x250 fs/splice.c:1332
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38

kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2987 [inline]
call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067
taprio_change+0x2fe5/0x4160 net/sched/sch_taprio.c:1597
qdisc_change net/sched/sch_api.c:1338 [inline]
tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1640
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2510
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1935
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
sock_no_sendpage+0xf3/0x130 net/core/sock.c:2998
kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504
kernel_sendpage net/socket.c:3501 [inline]
sock_sendpage+0xe5/0x140 net/socket.c:1003
pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364
splice_from_pipe_feed fs/splice.c:418 [inline]
__splice_from_pipe+0x43e/0x8a0 fs/splice.c:562
splice_from_pipe fs/splice.c:597 [inline]
generic_splice_sendpage+0xd4/0x140 fs/splice.c:746
do_splice_from fs/splice.c:767 [inline]
do_splice+0xb7e/0x1960 fs/splice.c:1079
__do_splice+0x134/0x250 fs/splice.c:1144
__do_sys_splice fs/splice.c:1350 [inline]
__se_sys_splice fs/splice.c:1332 [inline]
__x64_sys_splice+0x198/0x250 fs/splice.c:1332
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888079b90000

which belongs to the cache kmalloc-96 of size 96
The buggy address is located 64 bytes inside of

96-byte region [ffff888079b90000, ffff888079b90060)

The buggy address belongs to the page:

page:ffffea0001e6e400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888079b90f80 pfn:0x79b90

flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)

raw: 00fff00000000200 ffffea00006bcf88 ffffea0001e3b588 ffff888010c40300
raw: ffff888079b90f80 ffff888079b90000 0000000100000006 0000000000000000

page dumped because: kasan: bad access detected
page_owner tracks the page as allocated

page last allocated via order 0, migratetype Unmovable, gfp_mask 0x242220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 8434, ts 1000501276831, free_ts 996338348587
prep_new_page mm/page_alloc.c:2424 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
__alloc_pages_node include/linux/gfp.h:570 [inline]
kmem_getpages mm/slab.c:1377 [inline]
cache_grow_begin+0x75/0x460 mm/slab.c:2593
cache_alloc_refill+0x27f/0x380 mm/slab.c:2965
____cache_alloc mm/slab.c:3048 [inline]
____cache_alloc mm/slab.c:3031 [inline]
__do_cache_alloc mm/slab.c:3275 [inline]
slab_alloc mm/slab.c:3316 [inline]
kmem_cache_alloc_trace+0x38c/0x480 mm/slab.c:3573
kmalloc include/linux/slab.h:591 [inline]
dst_cow_metrics_generic+0x48/0x1e0 net/core/dst.c:199
dst_metrics_write_ptr include/net/dst.h:118 [inline]
dst_metric_set include/net/dst.h:179 [inline]
icmp6_dst_alloc+0x4f5/0x6c0 net/ipv6/route.c:3284
mld_sendpack+0x56f/0xe40 net/ipv6/mcast.c:1815
mld_send_cr net/ipv6/mcast.c:2127 [inline]
mld_ifc_work+0x71c/0xdc0 net/ipv6/mcast.c:2659
process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1338 [inline]
free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3315 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3394
slab_destroy mm/slab.c:1627 [inline]
slabs_destroy+0x89/0xc0 mm/slab.c:1647
cache_flusharray mm/slab.c:3418 [inline]
___cache_free+0x4c6/0x610 mm/slab.c:3480
qlink_free mm/kasan/quarantine.c:146 [inline]
qlist_free_all+0x4e/0x110 mm/kasan/quarantine.c:165
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
__kasan_slab_alloc+0x92/0xa0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook mm/slab.h:519 [inline]
slab_alloc mm/slab.c:3323 [inline]
kmem_cache_alloc+0x25f/0x540 mm/slab.c:3507
prepare_kernel_cred+0x27/0x890 kernel/cred.c:724
call_usermodehelper_exec_async+0x10e/0x580 kernel/umh.c:91
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:

ffff888079b8ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888079b8ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888079b90000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888079b90080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888079b90100: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.