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BUG: KASAN: use-after-free in __crypto_shash_import+0x241/0x290 crypto/shash.c:263
Write of size 1 at addr ffff888155a6f347 by task syz.0.209/6485

CPU: 1 UID: 0 PID: 6485 Comm: syz.0.209 Not tainted 6.15.0-syzkaller-01972-g914873bc7df9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 __crypto_shash_import+0x241/0x290 crypto/shash.c:263
 crypto_shash_import+0x88/0x260 crypto/shash.c:286
 crypto_ahash_import+0xcd/0x2a0 crypto/ahash.c:681
 hash_accept+0x33c/0x3d0 crypto/algif_hash.c:267
 do_accept+0x33e/0x530 net/socket.c:1924
 __sys_accept4_file net/socket.c:1964 [inline]
 __sys_accept4+0x100/0x1c0 net/socket.c:1993
 __do_sys_accept4 net/socket.c:2000 [inline]
 __se_sys_accept4 net/socket.c:1997 [inline]
 __x64_sys_accept4+0x96/0x100 net/socket.c:1997
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9e12f8e969
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:00007f9e13e8d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 00007f9e131b5fa0 RCX: 00007f9e12f8e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f9e13010ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000800 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9e131b5fa0 R15: 00007fffc747b0f8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x155a6f
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 ffffea0005569bc8 ffffea0005569bc8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff888155a6f200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888155a6f280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888155a6f300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff888155a6f380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888155a6f400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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