hid-generic 7FFF:0005:0004.022F: unknown main item tag 0x0 hid-generic 7FFF:0005:0004.022F: unknown main item tag 0x0 hid-generic 7FFF:0005:0004.022F: hidraw0: HID v0.03 Device [syz1] on syz1 ================================================================== BUG: KASAN: use-after-free in io_poll_check_events+0x994/0x9a0 fs/io_uring.c:5516 Read of size 4 at addr ffff88802e041d2c by task kworker/0:0/5 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events io_fallback_req_func Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x65/0x3a0 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 io_poll_check_events+0x994/0x9a0 fs/io_uring.c:5516 io_apoll_task_func+0x4c/0xb10 fs/io_uring.c:5590 io_fallback_req_func+0x118/0x1fd fs/io_uring.c:1400 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 Allocated by task 25768: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] kmem_cache_alloc_node+0x201/0x370 mm/slub.c:3266 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x52/0x9a0 kernel/fork.c:883 copy_process+0x64a/0x5aa0 kernel/fork.c:1998 kernel_clone+0x22a/0x7e0 kernel/fork.c:2555 __do_sys_clone kernel/fork.c:2672 [inline] __se_sys_clone kernel/fork.c:2656 [inline] __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 5: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x180 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kmem_cache_free+0xb6/0x1c0 mm/slub.c:3526 __io_req_complete_post+0x25c/0x470 fs/io_uring.c:1960 io_req_complete_post fs/io_uring.c:1972 [inline] io_req_complete_failed fs/io_uring.c:2003 [inline] io_apoll_task_func+0x226/0xb10 fs/io_uring.c:5602 io_fallback_req_func+0x118/0x1fd fs/io_uring.c:1400 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3026 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3106 context_switch kernel/sched/core.c:4990 [inline] __schedule+0x92e/0x1080 kernel/sched/core.c:6296 schedule+0x12b/0x1f0 kernel/sched/core.c:6369 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue+0x159/0x330 kernel/futex/waitwake.c:355 futex_wait+0x21b/0x5d0 kernel/futex/waitwake.c:656 do_futex+0x3af/0x490 kernel/futex/syscalls.c:106 __do_sys_futex kernel/futex/syscalls.c:183 [inline] __se_sys_futex+0x401/0x4b0 kernel/futex/syscalls.c:164 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3026 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3106 context_switch kernel/sched/core.c:4990 [inline] __schedule+0x92e/0x1080 kernel/sched/core.c:6296 schedule+0x12b/0x1f0 kernel/sched/core.c:6369 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue+0x159/0x330 kernel/futex/waitwake.c:355 futex_wait+0x21b/0x5d0 kernel/futex/waitwake.c:656 do_futex+0x3af/0x490 kernel/futex/syscalls.c:106 __do_sys_futex kernel/futex/syscalls.c:183 [inline] __se_sys_futex+0x401/0x4b0 kernel/futex/syscalls.c:164 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802e041d00 which belongs to the cache task_struct of size 7168 The buggy address is located 44 bytes inside of 7168-byte region [ffff88802e041d00, ffff88802e043900) The buggy address belongs to the page: page:ffffea0000b81000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2e040 head:ffffea0000b81000 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888078ca53c1 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001dfc200 dead000000000002 ffff888140006280 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888078ca53c1 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 20172, ts 553312202764, free_ts 549539792431 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x729/0x9e0 mm/page_alloc.c:4165 __alloc_pages+0x255/0x580 mm/page_alloc.c:5389 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0xce/0x3f0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x3fe/0xc30 mm/slub.c:3018 __slab_alloc mm/slub.c:3105 [inline] slab_alloc_node mm/slub.c:3196 [inline] kmem_cache_alloc_node+0x2bb/0x370 mm/slub.c:3266 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x52/0x9a0 kernel/fork.c:883 copy_process+0x64a/0x5aa0 kernel/fork.c:1998 kernel_clone+0x22a/0x7e0 kernel/fork.c:2555 __do_sys_clone kernel/fork.c:2672 [inline] __se_sys_clone kernel/fork.c:2656 [inline] __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0xd1c/0xe00 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3404 free_slab mm/slub.c:2043 [inline] discard_slab mm/slub.c:2049 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2536 put_cpu_partial+0x116/0x180 mm/slub.c:2612 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x107/0x160 mm/slub.c:3516 qlist_free_all mm/kasan/quarantine.c:176 [inline] kasan_quarantine_reduce+0x169/0x1f0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x1c9/0x310 mm/slub.c:3243 getname_flags+0xba/0x650 fs/namei.c:138 user_path_at_empty+0x2a/0x1a0 fs/namei.c:2850 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x10f/0x3b0 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:412 [inline] __se_sys_newfstatat+0xc8/0x760 fs/stat.c:406 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88802e041c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802e041c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802e041d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802e041d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802e041e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================