[syzbot] KASAN: use-after-free Read in nfc_llcp_put_ssap

From: syzbot
Date: Sat May 01 2021 - 01:50:52 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 18a3c5f7 Merge tag 'for_linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=161628b9d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9404cfa686df2c05
dashboard link: https://syzkaller.appspot.com/bug?extid=e4689b43d2ed2ed63611

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+e4689b43d2ed2ed63611@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:931 [inline]
BUG: KASAN: use-after-free in __mutex_lock+0x1034/0x1120 kernel/locking/mutex.c:1096
Read of size 8 at addr ffff88801a106080 by task syz-executor.0/31485

CPU: 1 PID: 31485 Comm: syz-executor.0 Not tainted 5.12.0-rc8-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:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
__mutex_lock_common kernel/locking/mutex.c:931 [inline]
__mutex_lock+0x1034/0x1120 kernel/locking/mutex.c:1096
nfc_llcp_put_ssap+0x49/0x2e0 net/nfc/llcp_core.c:492
llcp_sock_release+0x1d2/0x580 net/nfc/llcp_sock.c:626
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xbfc/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x47f/0x2150 kernel/signal.c:2781
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: Unable to access opcode bytes at RIP 0x4665cf.
RSP: 002b:00007fc68dddd218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000056bf68 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68
RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c
R13: 00007fff0986484f R14: 00007fc68dddd300 R15: 0000000000022000

Allocated by task 1:
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:427 [inline]
____kasan_kmalloc mm/kasan/common.c:506 [inline]
____kasan_kmalloc mm/kasan/common.c:465 [inline]
__kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
kmalloc include/linux/slab.h:554 [inline]
kzalloc include/linux/slab.h:684 [inline]
nfc_llcp_register_device+0x45/0x9d0 net/nfc/llcp_core.c:1572
nfc_register_device+0x6d/0x360 net/nfc/core.c:1124
nfcsim_device_new+0x345/0x5c1 drivers/nfc/nfcsim.c:408
nfcsim_init+0x71/0x14d drivers/nfc/nfcsim.c:455
do_one_initcall+0x103/0x650 init/main.c:1226
do_initcall_level init/main.c:1299 [inline]
do_initcalls init/main.c:1315 [inline]
do_basic_setup init/main.c:1335 [inline]
kernel_init_freeable+0x63e/0x6c2 init/main.c:1537
kernel_init+0xd/0x1b8 init/main.c:1424
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 31485:
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+0xf5/0x130 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:1562 [inline]
slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
slab_free mm/slub.c:3161 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4213
local_release net/nfc/llcp_core.c:175 [inline]
kref_put include/linux/kref.h:65 [inline]
nfc_llcp_local_put net/nfc/llcp_core.c:183 [inline]
nfc_llcp_local_put+0x194/0x200 net/nfc/llcp_core.c:178
llcp_sock_destruct+0x81/0x150 net/nfc/llcp_sock.c:950
__sk_destruct+0x4b/0x900 net/core/sock.c:1795
sk_destruct+0xbd/0xe0 net/core/sock.c:1839
__sk_free+0xef/0x3d0 net/core/sock.c:1850
sk_free+0x78/0xa0 net/core/sock.c:1861
sock_put include/net/sock.h:1807 [inline]
llcp_sock_release+0x3c9/0x580 net/nfc/llcp_sock.c:644
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xbfc/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x47f/0x2150 kernel/signal.c:2781
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88801a106000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
2048-byte region [ffff88801a106000, ffff88801a106800)
The buggy address belongs to the page:
page:ffffea0000684000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a100
head:ffffea0000684000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010442000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff88801a105f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801a106000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801a106080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801a106100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801a106180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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Next message: Anirudh Rayabharam: "[PATCH] rapidio: remove unused variable in rio_cm.c"
Previous message: syzbot: "[syzbot] KASAN: use-after-free Read in rdma_listen (3)"
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