KASAN: use-after-free Write in qdisc_class_hash_insert

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 775d01b6 Linux 4.14.154
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=173b7406e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=90a13857da9a45b6
dashboard link: https://syzkaller.appspot.com/bug?extid=2f0e4cb10cdf18e710ab
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2f0e4c...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:704
[inline]
BUG: KASAN: use-after-free in qdisc_class_hash_insert+0x269/0x280
net/sched/sch_api.c:694
Write of size 8 at addr ffff888091935e50 by task syz-executor.5/5389

CPU: 1 PID: 5389 Comm: syz-executor.5 Not tainted 4.14.154 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x142/0x197 lib/dump_stack.c:58
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
__asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435
hlist_add_head include/linux/list.h:704 [inline]
qdisc_class_hash_insert+0x269/0x280 net/sched/sch_api.c:694
qfq_change_class+0x8f4/0x115f net/sched/sch_qfq.c:500
tc_ctl_tclass+0x419/0xa70 net/sched/sch_api.c:1848
rtnetlink_rcv_msg+0x3eb/0xb70 net/core/rtnetlink.c:4285
netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4297
netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312
netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x152/0x3a0 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x35/0x60 net/socket.c:2178
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a669
RSP: 002b:00007f277a853c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f277a853c90 RCX: 000000000045a669
RDX: 0000000004924b68 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f277a8546d4
R13: 00000000004c8411 R14: 00000000004de860 R15: 0000000000000006

Allocated by task 5348:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618
kmalloc include/linux/slab.h:488 [inline]
kzalloc include/linux/slab.h:661 [inline]
qfq_change_class+0x6aa/0x115f net/sched/sch_qfq.c:475
tc_ctl_tclass+0x419/0xa70 net/sched/sch_api.c:1848
rtnetlink_rcv_msg+0x3eb/0xb70 net/core/rtnetlink.c:4285
netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4297
netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312
netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x152/0x3a0 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x35/0x60 net/socket.c:2178
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 5348:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xcc/0x270 mm/slab.c:3815
qfq_change_class+0xe11/0x115f net/sched/sch_qfq.c:529
tc_ctl_tclass+0x419/0xa70 net/sched/sch_api.c:1848
rtnetlink_rcv_msg+0x3eb/0xb70 net/core/rtnetlink.c:4285
netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4297
netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312
netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x152/0x3a0 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x35/0x60 net/socket.c:2178
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff888091935e40
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 16 bytes inside of
128-byte region [ffff888091935e40, ffff888091935ec0)
The buggy address belongs to the page:
page:ffffea0002464d40 count:1 mapcount:0 mapping:ffff888091935000
index:0xffff888091935b40
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff888091935000 ffff888091935b40 0000000100000014
raw: ffffea0002a19520 ffffea00021fe4a0 ffff8880aa800640 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff888091935d00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff888091935d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff888091935e00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff888091935e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888091935f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
==================================================================


---
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]

Hello,

syzbot found the following crash on:

HEAD commit: c63ee293 Linux 4.19.85
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17d19d5ae00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cbfad1c8058581ad
dashboard link: https://syzkaller.appspot.com/bug?extid=dd057ce4daf138b69e4c

compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

Reported-by: syzbot+dd057c...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:704
[inline]
BUG: KASAN: use-after-free in qdisc_class_hash_insert+0x269/0x280

net/sched/sch_api.c:713
Write of size 8 at addr ffff88809acf9f10 by task syz-executor.4/4398

CPU: 0 PID: 4398 Comm: syz-executor.4 Not tainted 4.19.85-syzkaller #0

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+0x197/0x210 lib/dump_stack.c:118
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
__asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438
hlist_add_head include/linux/list.h:704 [inline]
qdisc_class_hash_insert+0x269/0x280 net/sched/sch_api.c:713
qfq_change_class+0xa8d/0x15ce net/sched/sch_qfq.c:501
tc_ctl_tclass+0x4f8/0xc60 net/sched/sch_api.c:1990
rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4747
netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4765
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x537/0x720 net/netlink/af_netlink.c:1343
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:632
___sys_sendmsg+0x3e2/0x920 net/socket.c:2115
__sys_sendmmsg+0x1bf/0x4e0 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8c1db7dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f8c1db7dc90 RCX: 000000000045a639
RDX: 0000000004924b68 RSI: 0000000020000140 RDI: 0000000000000003

RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8c1db7e6d4
R13: 00000000004c83d1 R14: 00000000004de820 R15: 0000000000000004

Allocated by task 4383:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc mm/kasan/kasan.c:553 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
qfq_change_class+0x7e1/0x15ce net/sched/sch_qfq.c:476
tc_ctl_tclass+0x4f8/0xc60 net/sched/sch_api.c:1990
rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4747
netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4765
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x537/0x720 net/netlink/af_netlink.c:1343
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:632
___sys_sendmsg+0x3e2/0x920 net/socket.c:2115
__sys_sendmmsg+0x1bf/0x4e0 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4383:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3503 [inline]
kfree+0xcf/0x220 mm/slab.c:3822
qfq_change_class+0xff7/0x15ce net/sched/sch_qfq.c:530
tc_ctl_tclass+0x4f8/0xc60 net/sched/sch_api.c:1990
rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4747
netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4765
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x537/0x720 net/netlink/af_netlink.c:1343
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:632
___sys_sendmsg+0x3e2/0x920 net/socket.c:2115
__sys_sendmmsg+0x1bf/0x4e0 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809acf9f00

which belongs to the cache kmalloc-128 of size 128
The buggy address is located 16 bytes inside of

128-byte region [ffff88809acf9f00, ffff88809acf9f80)

The buggy address belongs to the page:

page:ffffea00026b3e40 count:1 mapcount:0 mapping:ffff88812c3f0640 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffffea00025bd948 ffffea00026601c8 ffff88812c3f0640
raw: 0000000000000000 ffff88809acf9000 0000000100000015 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff88809acf9e00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff88809acf9e80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
> ffff88809acf9f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88809acf9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88809acfa000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: 01364dad Linux 4.14.174
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11e58745e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=664dd71881ab2b2d

dashboard link: https://syzkaller.appspot.com/bug?extid=2f0e4cb10cdf18e710ab
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11cbab55e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=125c6eb1e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2f0e4c...@syzkaller.appspotmail.com

RDX: 0492492492492642 RSI: 0000000020000180 RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000001 R09: 00000000bb1414ac
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 000000000000000a R14: 0000000000000000 R15: 0000000000000000

==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:704 [inline]

BUG: KASAN: use-after-free in qdisc_class_hash_insert+0x25e/0x270 net/sched/sch_api.c:694
Write of size 8 at addr ffff88809ce1f9d0 by task syz-executor746/7503

CPU: 1 PID: 7503 Comm: syz-executor746 Not tainted 4.14.174-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]

dump_stack+0x13e/0x194 lib/dump_stack.c:58
print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252

kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]

kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393
hlist_add_head include/linux/list.h:704 [inline]
qdisc_class_hash_insert+0x25e/0x270 net/sched/sch_api.c:694
qfq_change_class+0x88f/0x1081 net/sched/sch_qfq.c:500
tc_ctl_tclass+0x3e2/0xa00 net/sched/sch_api.c:1848
rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x129/0x330 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x443da9
RSP: 002b:00007fff4325eea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fff4325ef20 RCX: 0000000000443da9
RDX: 0492492492492642 RSI: 0000000020000180 RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000001 R09: 00000000bb1414ac
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 000000000000000a R14: 0000000000000000 R15: 0000000000000000

Allocated by task 7503:
save_stack+0x32/0xa0 mm/kasan/kasan.c:447

set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]

kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
kmem_cache_alloc_trace+0x14d/0x7b0 mm/slab.c:3618

kmalloc include/linux/slab.h:488 [inline]
kzalloc include/linux/slab.h:661 [inline]

qfq_change_class+0x64e/0x1081 net/sched/sch_qfq.c:475
tc_ctl_tclass+0x3e2/0xa00 net/sched/sch_api.c:1848
rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x129/0x330 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 7503:
save_stack+0x32/0xa0 mm/kasan/kasan.c:447

set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]

kfree+0xcb/0x260 mm/slab.c:3815
qfq_change_class+0xd82/0x1081 net/sched/sch_qfq.c:529
tc_ctl_tclass+0x3e2/0xa00 net/sched/sch_api.c:1848
rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x129/0x330 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff88809ce1f9c0

which belongs to the cache kmalloc-128 of size 128
The buggy address is located 16 bytes inside of

128-byte region [ffff88809ce1f9c0, ffff88809ce1fa40)

The buggy address belongs to the page:

page:ffffea00027387c0 count:1 mapcount:0 mapping:ffff88809ce1f000 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff88809ce1f000 0000000000000000 0000000100000015
raw: ffffea000272b3e0 ffffea000294bb20 ffff88812fe56640 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff88809ce1f880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88809ce1f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809ce1f980: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff88809ce1fa00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88809ce1fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
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