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BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: null-ptr-deref in atomic_long_sub_and_test include/linux/atomic/atomic-instrumented.h:4521 [inline]
BUG: KASAN: null-ptr-deref in put_cred_many include/linux/cred.h:255 [inline]
BUG: KASAN: null-ptr-deref in put_cred include/linux/cred.h:269 [inline]
BUG: KASAN: null-ptr-deref in io_unregister_personality io_uring/register.c:82 [inline]
BUG: KASAN: null-ptr-deref in __io_uring_register io_uring/register.c:698 [inline]
BUG: KASAN: null-ptr-deref in __do_sys_io_uring_register io_uring/register.c:902 [inline]
BUG: KASAN: null-ptr-deref in __se_sys_io_uring_register+0x1227/0x3b60 io_uring/register.c:879
Write of size 8 at addr 0000000000000406 by task syz.5.98/6520

CPU: 0 UID: 0 PID: 6520 Comm: syz.5.98 Not tainted 6.13.0-rc1-next-20241205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_report+0xe8/0x550 mm/kasan/report.c:492
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_long_sub_and_test include/linux/atomic/atomic-instrumented.h:4521 [inline]
 put_cred_many include/linux/cred.h:255 [inline]
 put_cred include/linux/cred.h:269 [inline]
 io_unregister_personality io_uring/register.c:82 [inline]
 __io_uring_register io_uring/register.c:698 [inline]
 __do_sys_io_uring_register io_uring/register.c:902 [inline]
 __se_sys_io_uring_register+0x1227/0x3b60 io_uring/register.c:879
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe4cf97fed9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe4d06a9058 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00007fe4cfb46160 RCX: 00007fe4cf97fed9
RDX: 0000000000000000 RSI: 000000000000000a RDI: 000000000000000b
RBP: 00007fe4cf9f3cc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe4cfb46160 R15: 00007ffde05e39e8
 </TASK>
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