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BUG: KASAN: use-after-free in __io_req_task_work_add+0x6b4/0x760 io_uring/io_uring.c:1287
Read of size 8 at addr ffff888079642598 by task syz-executor.1/5861

CPU: 0 PID: 5861 Comm: syz-executor.1 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xc0/0xf0 mm/kasan/report.c:517
 __io_req_task_work_add+0x6b4/0x760 io_uring/io_uring.c:1287
 io_req_task_work_add io_uring/io_uring.h:95 [inline]
 __io_poll_execute io_uring/poll.c:366 [inline]
 io_poll_execute.constprop.0+0x15b/0x190 io_uring/poll.c:372
 io_poll_cancel_req io_uring/poll.c:379 [inline]
 io_poll_remove_all_table+0x26d/0x2bd io_uring/poll.c:741
 io_poll_remove_all+0x2e/0x4b io_uring/poll.c:759
 io_ring_ctx_wait_and_kill+0x1a0/0x340 io_uring/io_uring.c:3017
 io_uring_release+0x46/0x4a io_uring/io_uring.c:3042
 __fput+0x27c/0xa90 fs/file_table.c:321
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xb17/0x2a90 kernel/exit.c:867
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
 __do_sys_exit_group kernel/exit.c:1023 [inline]
 __se_sys_exit_group kernel/exit.c:1021 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd52028c0c9
Code: Unable to access opcode bytes at 0x7fd52028c09f.
RSP: 002b:00007ffd0e2d8f78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fd52028c0c9
RDX: 00007fd52023df7b RSI: ffffffffffffffb8 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000023b38e02 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd0e2d9060
 </TASK>

Allocated by task 5861:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:769 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 kmem_cache_alloc_node+0x183/0x350 mm/slub.c:3497
 alloc_task_struct_node kernel/fork.c:171 [inline]
 dup_task_struct kernel/fork.c:979 [inline]
 copy_process+0x3aa/0x7740 kernel/fork.c:2103
 kernel_clone+0xeb/0x9a0 kernel/fork.c:2687
 __do_sys_clone+0xba/0x100 kernel/fork.c:2828
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 15:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
 put_task_struct include/linux/sched/task.h:119 [inline]
 delayed_put_task_struct+0x26e/0x3f0 kernel/exit.c:225
 rcu_do_batch kernel/rcu/tree.c:2113 [inline]
 rcu_core+0x821/0x1920 kernel/rcu/tree.c:2373
 __do_softirq+0x1fb/0xaf6 kernel/softirq.c:571

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
 __call_rcu_common.constprop.0+0x99/0x780 kernel/rcu/tree.c:2622
 put_task_struct_rcu_user+0x83/0xc0 kernel/exit.c:231
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0x25d8/0x5a70 kernel/sched/core.c:6619
 schedule+0xde/0x1b0 kernel/sched/core.c:6695
 schedule_timeout+0x1e1/0x2a0 kernel/time/timer.c:2143
 unix_wait_for_peer+0x244/0x280 net/unix/af_unix.c:1449
 unix_dgram_sendmsg+0x1943/0x1c30 net/unix/af_unix.c:2047
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
 __sys_sendmmsg+0x18f/0x460 net/socket.c:2616
 __do_sys_sendmmsg net/socket.c:2645 [inline]
 __se_sys_sendmmsg net/socket.c:2642 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Second to last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
 __call_rcu_common.constprop.0+0x99/0x780 kernel/rcu/tree.c:2622
 put_task_struct_rcu_user+0x83/0xc0 kernel/exit.c:231
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0x25d8/0x5a70 kernel/sched/core.c:6619
 schedule+0xde/0x1b0 kernel/sched/core.c:6695
 futex_wait_queue+0xf9/0x1f0 kernel/futex/waitwake.c:355
 futex_wait+0x292/0x680 kernel/futex/waitwake.c:656
 do_futex+0x2e8/0x360 kernel/futex/syscalls.c:106
 __do_sys_futex kernel/futex/syscalls.c:183 [inline]
 __se_sys_futex kernel/futex/syscalls.c:164 [inline]
 __x64_sys_futex+0x1ca/0x4d0 kernel/futex/syscalls.c:164
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888079641d40
 which belongs to the cache task_struct of size 7232
The buggy address is located 2136 bytes inside of
 7232-byte region [ffff888079641d40, ffff888079643980)

The buggy address belongs to the physical page:
page:ffffea0001e59000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79640
head:ffffea0001e59000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888070364b01
ksm flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff8880125ec500 ffffea0000d24400 0000000000000003
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888070364b01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5631, tgid 5631 (syz-executor.3), ts 260109994922, free_ts 260102898875
 prep_new_page mm/page_alloc.c:2549 [inline]
 get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 kmem_cache_alloc_node+0x136/0x350 mm/slub.c:3497
 alloc_task_struct_node kernel/fork.c:171 [inline]
 dup_task_struct kernel/fork.c:979 [inline]
 copy_process+0x3aa/0x7740 kernel/fork.c:2103
 kernel_clone+0xeb/0x9a0 kernel/fork.c:2687
 __do_sys_clone+0xba/0x100 kernel/fork.c:2828
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1451 [inline]
 free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:769 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x175/0x320 mm/slub.c:3476
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140
 getname_flags+0x9e/0xe0 include/linux/audit.h:320
 vfs_fstatat+0x77/0xb0 fs/stat.c:275
 __do_sys_newfstatat+0x8a/0x110 fs/stat.c:446
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888079642480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888079642500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888079642580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888079642600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888079642680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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