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BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26
Read of size 8 at addr ffff88803f758570 by task syz-executor.3/21109
CPU: 0 PID: 21109 Comm: syz-executor.3 Not tainted 5.8.0-rc4-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+0x18f/0x20d lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
__list_add_valid+0x93/0xa0 lib/list_debug.c:26
__list_add include/linux/list.h:67 [inline]
list_add_tail include/linux/list.h:100 [inline]
linkwatch_add_event net/core/link_watch.c:111 [inline]
linkwatch_fire_event+0xea/0x1d0 net/core/link_watch.c:261
netif_carrier_off net/sched/sch_generic.c:513 [inline]
netif_carrier_off+0x96/0xb0 net/sched/sch_generic.c:507
__tun_detach+0xf2b/0x1310 drivers/net/tun.c:687
tun_detach drivers/net/tun.c:708 [inline]
tun_chr_close+0xd9/0x180 drivers/net/tun.c:3423
__fput+0x33c/0x880 fs/file_table.c:281
task_work_run+0xdd/0x190 kernel/task_work.c:135
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop arch/x86/entry/common.c:239 [inline]
__prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:269
do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x415d71
Code: Bad RIP value.
RSP: 002b:00007ffcf2a5a260 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000415d71
RDX: 0000000000000000 RSI: 0000000000000c71 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00000000c9422c71 R09: 00000000c9422c75
R10: 00007ffcf2a5a350 R11: 0000000000000293 R12: 00000000007903d0
R13: 0000000000266536 R14: ffffffffffffffff R15: 000000000078bf0c
Allocated by task 21059:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
kmalloc_node include/linux/slab.h:578 [inline]
kvmalloc_node+0xb4/0xf0 mm/util.c:574
kvmalloc include/linux/mm.h:753 [inline]
kvzalloc include/linux/mm.h:761 [inline]
alloc_netdev_mqs+0x97/0xdc0 net/core/dev.c:9938
rtnl_create_link+0x219/0xad0 net/core/rtnetlink.c:3067
__rtnl_newlink+0xfa0/0x1750 net/core/rtnetlink.c:3329
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398
rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 21059:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
kasan_set_free_info mm/kasan/common.c:316 [inline]
__kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
__cache_free mm/slab.c:3426 [inline]
kfree+0x103/0x2c0 mm/slab.c:3757
kvfree+0x42/0x50 mm/util.c:603
device_release+0x71/0x200 drivers/base/core.c:1559
kobject_cleanup lib/kobject.c:693 [inline]
kobject_release lib/kobject.c:722 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1c0/0x270 lib/kobject.c:739
put_device+0x1b/0x30 drivers/base/core.c:2779
free_netdev+0x35d/0x480 net/core/dev.c:10054
__rtnl_newlink+0x14d8/0x1750 net/core/rtnetlink.c:3354
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398
rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff88803f758000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 1392 bytes inside of
8192-byte region [ffff88803f758000, ffff88803f75a000)
The buggy address belongs to the page:
page:ffffea0000fdd600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0000fdd600 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea000105d308 ffffea0000eef408 ffff8880aa0021c0
raw: 0000000000000000 ffff88803f758000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803f758400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803f758480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803f758500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88803f758580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803f758600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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