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BUG: KASAN: use-after-free in ctx_flush_and_put fs/io_uring.c:2037 [inline]
BUG: KASAN: use-after-free in tctx_task_work+0x307/0x310 fs/io_uring.c:2084
Read of size 4 at addr ffff88807c6a6358 by task syz-executor.2/9577

CPU: 0 PID: 9577 Comm: syz-executor.2 Not tainted 5.14.0-rc6-next-20210820-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 ctx_flush_and_put fs/io_uring.c:2037 [inline]
 tctx_task_work+0x307/0x310 fs/io_uring.c:2084
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbae/0x2a30 kernel/exit.c:825
 do_group_exit+0x129/0x310 kernel/exit.c:922
 get_signal+0x482/0x2170 kernel/signal.c:2846
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: Unable to access opcode bytes at RIP 0x4665bf.
RSP: 002b:00007f8107512188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 000000000000307e RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 000000000000688c RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffeba93dc9f R14: 00007f8107512300 R15: 0000000000022000

Allocated by task 9567:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa8/0xe0 mm/kasan/common.c:522
 kmalloc include/linux/slab.h:594 [inline]
 kzalloc include/linux/slab.h:731 [inline]
 io_ring_ctx_alloc fs/io_uring.c:1237 [inline]
 io_uring_create fs/io_uring.c:9876 [inline]
 io_uring_setup+0x27d/0x2d00 fs/io_uring.c:9982
 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+0x44/0xae

Freed by task 1128:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0x103/0x140 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1681 [inline]
 slab_free_freelist_hook+0x85/0x190 mm/slub.c:1706
 slab_free mm/slub.c:3459 [inline]
 kfree+0xea/0x540 mm/slub.c:4519
 io_ring_ctx_free fs/io_uring.c:8902 [inline]
 io_ring_exit_work+0x13c7/0x1940 fs/io_uring.c:9051
 process_one_work+0x9c9/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x65b/0x1200 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xed/0x120 mm/kasan/generic.c:348
 insert_work+0x48/0x370 kernel/workqueue.c:1353
 __queue_work+0x5d1/0xf30 kernel/workqueue.c:1519
 queue_work_on+0xf6/0x110 kernel/workqueue.c:1546
 queue_work include/linux/workqueue.h:502 [inline]
 io_ring_ctx_wait_and_kill+0x314/0x3d0 fs/io_uring.c:9104
 io_uring_release+0x3e/0x50 fs/io_uring.c:9112
 __fput+0x288/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbae/0x2a30 kernel/exit.c:825
 do_group_exit+0x129/0x310 kernel/exit.c:922
 get_signal+0x482/0x2170 kernel/signal.c:2846
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88807c6a6000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 856 bytes inside of
 4096-byte region [ffff88807c6a6000, ffff88807c6a7000)
The buggy address belongs to the page:
page:ffffea0001f1a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c6a0
head:ffffea0001f1a800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001f32800 0000000200000002 ffff888010c42140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2999, ts 18356701169, free_ts 18348940670
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa76/0x2f90 mm/page_alloc.c:4151
 __alloc_pages+0x1ba/0x510 mm/page_alloc.c:5373
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2188
 alloc_slab_page mm/slub.c:1744 [inline]
 allocate_slab mm/slub.c:1881 [inline]
 new_slab+0x321/0x490 mm/slub.c:1944
 ___slab_alloc+0x937/0x1000 mm/slub.c:2970
 __slab_alloc.constprop.0+0x51/0xa0 mm/slub.c:3057
 slab_alloc_node mm/slub.c:3148 [inline]
 slab_alloc mm/slub.c:3190 [inline]
 kmem_cache_alloc_trace+0x307/0x3c0 mm/slub.c:3207
 kmalloc include/linux/slab.h:594 [inline]
 tomoyo_print_header security/tomoyo/audit.c:156 [inline]
 tomoyo_init_log+0x18a/0x1ee0 security/tomoyo/audit.c:255
 tomoyo_supervisor+0x34a/0xeb0 security/tomoyo/common.c:2097
 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline]
 tomoyo_env_perm+0x17f/0x1f0 security/tomoyo/environ.c:63
 tomoyo_environ security/tomoyo/domain.c:672 [inline]
 tomoyo_find_next_domain+0x1381/0x1ec0 security/tomoyo/domain.c:879
 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline]
 tomoyo_bprm_check_security+0x125/0x1b0 security/tomoyo/tomoyo.c:91
 security_bprm_check+0x49/0xb0 security/security.c:866
 search_binary_handler fs/exec.c:1711 [inline]
 exec_binprm fs/exec.c:1764 [inline]
 bprm_execve fs/exec.c:1833 [inline]
 bprm_execve+0x73c/0x19c0 fs/exec.c:1795
 do_execveat_common+0x5c8/0x760 fs/exec.c:1922
 do_execve fs/exec.c:1990 [inline]
 __do_sys_execve fs/exec.c:2066 [inline]
 __se_sys_execve fs/exec.c:2061 [inline]
 __x64_sys_execve+0x8c/0xb0 fs/exec.c:2061
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x377/0x860 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3394
 __unfreeze_partials+0x184/0x1a0 mm/slub.c:2476
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xd0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x185/0x210 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0xa1/0xc0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3182 [inline]
 slab_alloc mm/slub.c:3190 [inline]
 kmem_cache_alloc+0x209/0x390 mm/slub.c:3195
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags+0x9a/0xe0 include/linux/audit.h:319
 user_path_at_empty+0x2b/0x90 fs/namei.c:2801
 do_readlinkat+0xcd/0x2f0 fs/stat.c:443
 __do_sys_readlinkat fs/stat.c:470 [inline]
 __se_sys_readlinkat fs/stat.c:467 [inline]
 __x64_sys_readlinkat+0x93/0x100 fs/stat.c:467
 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+0x44/0xae

Memory state around the buggy address:
 ffff88807c6a6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807c6a6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807c6a6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88807c6a6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807c6a6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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