================================================================== BUG: KASAN: use-after-free in radix_tree_next_slot include/linux/radix-tree.h:422 [inline] BUG: KASAN: use-after-free in idr_for_each+0x1a8/0x1c4 lib/idr.c:202 Read of size 8 at addr ffff00001a2ee880 by task syz-executor.0/5528 CPU: 0 PID: 5528 Comm: syz-executor.0 Not tainted 5.11.0-rc5-syzkaller-00239-gbec4c2968fce #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x0/0x3e0 arch/arm64/include/asm/pointer_auth.h:76 show_stack+0x1c/0x70 arch/arm64/kernel/stacktrace.c:196 __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x110/0x188 lib/dump_stack.c:120 print_address_description.constprop.0+0x2c/0x300 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report+0x1e8/0x200 mm/kasan/report.c:413 __asan_report_load8_noabort+0x38/0x6c mm/kasan/report_generic.c:309 radix_tree_next_slot include/linux/radix-tree.h:422 [inline] idr_for_each+0x1a8/0x1c4 lib/idr.c:202 io_ring_ctx_wait_and_kill+0x16c/0x4d0 fs/io_uring.c:8788 io_uring_release+0x34/0x54 fs/io_uring.c:8813 __fput+0x1a0/0x6ac fs/file_table.c:280 ____fput+0x14/0x20 fs/file_table.c:313 task_work_run+0xd8/0x210 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x940/0x2330 kernel/exit.c:825 do_group_exit+0xd0/0x240 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __arm64_sys_exit_group+0x40/0x50 kernel/exit.c:931 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x110/0x3c0 arch/arm64/kernel/syscall.c:159 do_el0_svc_compat+0x44/0x7c arch/arm64/kernel/syscall.c:204 el0_svc_compat+0x20/0x30 arch/arm64/kernel/entry-common.c:442 el0_sync_compat_handler+0x94/0x150 arch/arm64/kernel/entry-common.c:451 el0_sync_compat+0x178/0x180 arch/arm64/kernel/entry.S:708 Allocated by task 5537: stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x8c/0xb4 mm/kasan/common.c:429 __kasan_slab_alloc+0x1c/0x30 mm/kasan/common.c:437 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2892 [inline] slab_alloc mm/slub.c:2900 [inline] kmem_cache_alloc+0x1c4/0x5c0 mm/slub.c:2905 radix_tree_node_alloc.constprop.0+0xec/0x3a0 lib/radix-tree.c:274 idr_get_free+0x2e8/0x910 lib/radix-tree.c:1504 idr_alloc_u32+0x120/0x280 lib/idr.c:46 idr_alloc_cyclic+0xe8/0x1b4 lib/idr.c:125 io_register_personality fs/io_uring.c:9862 [inline] __io_uring_register fs/io_uring.c:10091 [inline] __do_sys_io_uring_register fs/io_uring.c:10141 [inline] __se_sys_io_uring_register fs/io_uring.c:10123 [inline] __arm64_sys_io_uring_register+0x77c/0x3dac fs/io_uring.c:10123 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x110/0x3c0 arch/arm64/kernel/syscall.c:159 do_el0_svc_compat+0x44/0x7c arch/arm64/kernel/syscall.c:204 el0_svc_compat+0x20/0x30 arch/arm64/kernel/entry-common.c:442 el0_sync_compat_handler+0x94/0x150 arch/arm64/kernel/entry-common.c:451 el0_sync_compat+0x178/0x180 arch/arm64/kernel/entry.S:708 Freed by task 7: stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38 kasan_set_track+0x2c/0x40 mm/kasan/common.c:46 kasan_set_free_info+0x2c/0x50 mm/kasan/generic.c:356 ____kasan_slab_free+0xf0/0x154 mm/kasan/common.c:362 __kasan_slab_free+0x18/0x24 mm/kasan/common.c:369 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x8c/0x240 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kmem_cache_free+0xc4/0x5ac mm/slub.c:3159 radix_tree_node_rcu_free+0x7c/0xb0 lib/radix-tree.c:302 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x860/0xe10 kernel/rcu/tree.c:2723 rcu_core_si+0x14/0x20 kernel/rcu/tree.c:2736 _stext+0x404/0x10cc Last potentially related work creation: stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38 kasan_record_aux_stack+0xfc/0x134 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xf8/0x5f0 kernel/rcu/tree.c:3038 radix_tree_node_free lib/radix-tree.c:308 [inline] delete_node+0x2fc/0x50c lib/radix-tree.c:571 __radix_tree_delete+0x134/0x3dc lib/radix-tree.c:1377 radix_tree_delete_item+0xbc/0x1c0 lib/radix-tree.c:1428 idr_remove+0x50/0x70 lib/idr.c:154 io_remove_personalities+0x1c/0x154 fs/io_uring.c:8733 idr_for_each+0xec/0x1c4 lib/idr.c:208 io_ring_ctx_wait_and_kill+0x16c/0x4d0 fs/io_uring.c:8788 io_uring_release+0x34/0x54 fs/io_uring.c:8813 __fput+0x1a0/0x6ac fs/file_table.c:280 ____fput+0x14/0x20 fs/file_table.c:313 task_work_run+0xd8/0x210 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x940/0x2330 kernel/exit.c:825 do_group_exit+0xd0/0x240 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __arm64_sys_exit_group+0x40/0x50 kernel/exit.c:931 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x110/0x3c0 arch/arm64/kernel/syscall.c:159 do_el0_svc_compat+0x44/0x7c arch/arm64/kernel/syscall.c:204 el0_svc_compat+0x20/0x30 arch/arm64/kernel/entry-common.c:442 el0_sync_compat_handler+0x94/0x150 arch/arm64/kernel/entry-common.c:451 el0_sync_compat+0x178/0x180 arch/arm64/kernel/entry.S:708 Second to last potentially related work creation: stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:121 kasan_save_stack+0x2c/0x5c mm/kasan/common.c:38 kasan_record_aux_stack+0xfc/0x134 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xf8/0x5f0 kernel/rcu/tree.c:3038 xa_node_free lib/xarray.c:258 [inline] xas_delete_node lib/xarray.c:494 [inline] update_node lib/xarray.c:756 [inline] xas_store+0x674/0x1284 lib/xarray.c:841 page_cache_delete+0x1b8/0x550 mm/filemap.c:138 __delete_from_page_cache mm/filemap.c:239 [inline] delete_from_page_cache+0xec/0x1a0 mm/filemap.c:274 truncate_inode_page+0x74/0xbc mm/truncate.c:228 shmem_undo_range+0x540/0xecc mm/shmem.c:949 shmem_truncate_range mm/shmem.c:1058 [inline] shmem_evict_inode+0x2dc/0x834 mm/shmem.c:1158 evict+0x1fc/0x4c0 fs/inode.c:577 iput_final fs/inode.c:1653 [inline] iput fs/inode.c:1679 [inline] iput+0x44c/0x7bc fs/inode.c:1665 dentry_unlink_inode+0x21c/0x404 fs/dcache.c:374 __dentry_kill+0x298/0x560 fs/dcache.c:579 dentry_kill fs/dcache.c:705 [inline] dput+0x44c/0x870 fs/dcache.c:885 __fput+0x240/0x6ac fs/file_table.c:293 ____fput+0x14/0x20 fs/file_table.c:313 task_work_run+0xd8/0x210 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x12e4/0x25fc arch/arm64/kernel/signal.c:939 work_pending+0xc/0x35c The buggy address belongs to the object at ffff00001a2ee840 which belongs to the cache radix_tree_node of size 576 The buggy address is located 64 bytes inside of 576-byte region [ffff00001a2ee840, ffff00001a2eea80) The buggy address belongs to the page: page:00000000c09f29be refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a2ee head:00000000c09f29be order:1 compound_mapcount:0 flags: 0x1ffc00000010200(slab|head) raw: 01ffc00000010200 dead000000000100 dead000000000122 ffff00000c40ca80 raw: 0000000000000000 00000000800b000b 00000001ffffffff ffff0000156b0601 page dumped because: kasan: bad access detected pages's memcg:ffff0000156b0601 Memory state around the buggy address: ffff00001a2ee780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff00001a2ee800: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff00001a2ee880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00001a2ee900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00001a2ee980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================