[syzbot] [tipc?] KASAN: user-memory-access Write in tipc_crypto_stop

Hello,

syzbot found the following issue on:

HEAD commit:    0f70f5b08a47 Merge tag 'pull-automount' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=157dd00c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=22765942f2e2ebcf
dashboard link: https://syzkaller.appspot.com/bug?extid=2434dfff4223d77e8e1d
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f091df6896fd/disk-0f70f5b0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/978b2a8699d8/vmlinux-0f70f5b0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b6e13557ddc0/bzImage-0f70f5b0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2434dfff4223d77e8e1d@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: user-memory-access in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: user-memory-access in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline]
BUG: KASAN: user-memory-access in __refcount_sub_and_test include/linux/refcount.h:389 [inline]
BUG: KASAN: user-memory-access in __refcount_dec_and_test include/linux/refcount.h:432 [inline]
BUG: KASAN: user-memory-access in refcount_dec_and_test include/linux/refcount.h:450 [inline]
BUG: KASAN: user-memory-access in tipc_aead_put net/tipc/crypto.c:398 [inline]
BUG: KASAN: user-memory-access in tipc_crypto_stop+0x1fb/0x430 net/tipc/crypto.c:1536
Write of size 4 at addr 00000000ffff00c0 by task kworker/u8:0/12

CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted 6.15.0-syzkaller-09161-g0f70f5b08a47 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline]
 __refcount_sub_and_test include/linux/refcount.h:389 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 tipc_aead_put net/tipc/crypto.c:398 [inline]
 tipc_crypto_stop+0x1fb/0x430 net/tipc/crypto.c:1536
 tipc_exit_net+0x7b/0x140 net/tipc/core.c:119
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:253
 cleanup_net+0x4c5/0x8a0 net/core/net_namespace.c:686
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
==================================================================


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