RSP: 002b:00007feafde020c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007feafdf8ef80 RCX: 00007feafde7cb69
RDX: 0000000000000000 RSI: 00000000000022ff RDI: 0000000000000003
RBP: 00007feafde02120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007feafdf8ef80 R15: 00007ffc117f1bc8
==================================================================
BUG: KASAN: use-after-free in io_queue_link_head+0x2d0/0x3d0 fs/io_uring.c:2535
Read of size 8 at addr ffff8881ef4527d0 by task syz-executor.0/420

CPU: 1 PID: 420 Comm: syz-executor.0 Not tainted 5.4.281-syzkaller-04937-gd883a2284ec1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 io_queue_link_head+0x2d0/0x3d0 fs/io_uring.c:2535
 io_ring_submit fs/io_uring.c:2964 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3728 [inline]
 __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3689
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7feafde7cb69
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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feafde020c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007feafdf8ef80 RCX: 00007feafde7cb69
RDX: 0000000000000000 RSI: 00000000000022ff RDI: 0000000000000003
RBP: 00007feafde02120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007feafdf8ef80 R15: 00007ffc117f1bc8

Allocated by task 420:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 kmem_cache_alloc_bulk+0x1d3/0x2f0 mm/slub.c:3291
 io_get_req+0x16a/0x580 fs/io_uring.c:651
 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2572
 io_ring_submit fs/io_uring.c:2960 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3728 [inline]
 __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3689
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 420:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 io_queue_link_head+0x2b2/0x3d0 fs/io_uring.c:2533
 io_ring_submit fs/io_uring.c:2964 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3728 [inline]
 __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3689
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the object at ffff8881ef452780
 which belongs to the cache io_kiocb of size 264
The buggy address is located 80 bytes inside of
 264-byte region [ffff8881ef452780, ffff8881ef452888)
The buggy address belongs to the page:
page:ffffea0007bd1480 refcount:1 mapcount:0 mapping:ffff8881f0ee6280 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0ee6280
raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 kmem_cache_alloc_bulk+0xe6/0x2f0 mm/slub.c:3265
 io_get_req+0x16a/0x580 fs/io_uring.c:651
 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2572
 io_ring_submit fs/io_uring.c:2960 [inline]
 __do_sys_io_uring_enter fs/io_uring.c:3728 [inline]
 __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3689
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4955 [inline]
 __free_pages+0x91/0x140 mm/page_alloc.c:4961
 __free_slab+0x221/0x2e0 mm/slub.c:1774
 free_slab mm/slub.c:1789 [inline]
 discard_slab mm/slub.c:1795 [inline]
 unfreeze_partials+0x14e/0x180 mm/slub.c:2288
 put_cpu_partial+0x44/0x180 mm/slub.c:2324
 __slab_free+0x297/0x360 mm/slub.c:2971
 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167
 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260
 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 getname_flags+0xb8/0x4e0 fs/namei.c:141
 user_path_at_empty+0x28/0x50 fs/namei.c:2703
 do_readlinkat+0x114/0x3a0 fs/stat.c:398
 __do_sys_readlink fs/stat.c:431 [inline]
 __se_sys_readlink fs/stat.c:428 [inline]
 __x64_sys_readlink+0x7b/0x90 fs/stat.c:428
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881ef452680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881ef452700: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881ef452780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8881ef452800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881ef452880: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================