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BUG: KASAN: slab-use-after-free in __lock_acquire+0x340f/0x4430
Read of size 8 at addr ffff88800981b620 by task syz-executor.7/9719

CPU: 0 UID: 0 PID: 9719 Comm: syz-executor.7 Not tainted 6.12.0-rc7-next-20241115 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xca/0x120
 print_report+0xcb/0x620
 kasan_report+0xbd/0xf0
 __lock_acquire+0x340f/0x4430
 lock_acquire.part.0+0xeb/0x320
 _raw_spin_lock+0x2b/0x40
 sco_sock_connect+0x347/0x9c0
 __sys_connect_file+0x14b/0x1b0
 __sys_connect+0x174/0x1a0
 __x64_sys_connect+0x73/0xb0
 do_syscall_64+0xbf/0x1d0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f334473db19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3341c92188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f3344851020 RCX: 00007f334473db19
RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f3344797f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe56fc723f R14: 00007f3341c92300 R15: 0000000000022000
 </TASK>

Allocated by task 9712:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 __kasan_kmalloc+0x7f/0x90
 sco_conn_add+0x11d/0x4a0
 sco_sock_connect+0x320/0x9c0
 __sys_connect_file+0x14b/0x1b0
 __sys_connect+0x174/0x1a0
 __x64_sys_connect+0x73/0xb0
 do_syscall_64+0xbf/0x1d0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 9712:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3a/0x60
 __kasan_slab_free+0x38/0x50
 kfree+0x132/0x480
 sco_chan_del+0x1bc/0x1f0
 __sco_sock_close+0x212/0x2e0
 sco_sock_release+0xa1/0x3f0
 __sock_release+0xb3/0x270
 sock_close+0x1c/0x30
 __fput+0x3fa/0xb40
 task_work_run+0x173/0x280
 get_signal+0x1cf/0x2320
 arch_do_signal_or_restart+0x81/0x780
 syscall_exit_to_user_mode+0x123/0x1e0
 do_syscall_64+0xcc/0x1d0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88800981b600
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 32 bytes inside of
 freed 256-byte region [ffff88800981b600, ffff88800981b700)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800981b000 pfn:0x981a
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c41b40 ffffea00004c0200 dead000000000003
raw: ffff88800981b000 000000008010000e 00000001f5000000 0000000000000000
head: 0100000000000040 ffff888008c41b40 ffffea00004c0200 dead000000000003
head: ffff88800981b000 000000008010000e 00000001f5000000 0000000000000000
head: 0100000000000001 ffffea0000260681 ffffffffffffffff 0000000000000000
head: ffff888000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88800981b500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88800981b580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88800981b600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88800981b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88800981b700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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