================================================================== 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+0x1fe/0x2c0 lib/idr.c:202 Read of size 8 at addr ffff8880785e3378 by task syz-executor.3/13242 CPU: 1 PID: 13242 Comm: syz-executor.3 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x183/0x22e lib/dump_stack.c:120 print_address_description+0x5f/0x3b0 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report+0x15e/0x200 mm/kasan/report.c:413 radix_tree_next_slot include/linux/radix-tree.h:422 [inline] idr_for_each+0x1fe/0x2c0 lib/idr.c:202 io_ring_ctx_wait_and_kill+0x1f0/0x400 fs/io_uring.c:8767 io_uring_release+0x57/0x70 fs/io_uring.c:8792 __fput+0x34d/0x7a0 fs/file_table.c:280 task_work_run+0x137/0x1c0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x769/0x2490 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x16b5/0x2030 kernel/signal.c:2770 arch_do_signal_or_restart+0x8e/0x6a0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0xac/0x1e0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x48/0x190 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: Unable to access opcode bytes at RIP 0x45e1ef. RSP: 002b:00007f550f4a8cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000119c030 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c030 RBP: 000000000119c028 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffd32a61edf R14: 00007f550f4a99c0 R15: 000000000119c034 Allocated by task 13237: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc+0xbd/0xf0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2891 [inline] slab_alloc mm/slub.c:2899 [inline] kmem_cache_alloc+0x1d7/0x2e0 mm/slub.c:2904 radix_tree_node_alloc+0x8b/0x3b0 lib/radix-tree.c:274 idr_get_free+0x2ca/0xb60 lib/radix-tree.c:1504 idr_alloc_u32 lib/idr.c:46 [inline] idr_alloc_cyclic+0x1cc/0x5a0 lib/idr.c:125 io_register_personality fs/io_uring.c:9835 [inline] __io_uring_register fs/io_uring.c:10064 [inline] __do_sys_io_uring_register fs/io_uring.c:10114 [inline] __se_sys_io_uring_register+0xc9e/0x28f0 fs/io_uring.c:10096 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 25764: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:356 ____kasan_slab_free+0xe2/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x85/0x160 mm/slub.c:3158 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x840/0x1180 kernel/rcu/tree.c:2723 __do_softirq+0x372/0x7a6 kernel/softirq.c:343 Last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x100 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0x166/0x8b0 kernel/rcu/tree.c:3038 radix_tree_node_free lib/radix-tree.c:308 [inline] delete_node+0x1bf/0x7d0 lib/radix-tree.c:571 radix_tree_delete_item+0x2e2/0x3e0 lib/radix-tree.c:1428 io_remove_personalities+0x21/0x150 fs/io_uring.c:8712 idr_for_each+0x16b/0x2c0 lib/idr.c:208 io_ring_ctx_wait_and_kill+0x1f0/0x400 fs/io_uring.c:8767 io_uring_release+0x57/0x70 fs/io_uring.c:8792 __fput+0x34d/0x7a0 fs/file_table.c:280 task_work_run+0x137/0x1c0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x769/0x2490 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x16b5/0x2030 kernel/signal.c:2770 arch_do_signal_or_restart+0x8e/0x6a0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0xac/0x1e0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x48/0x190 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Second to last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x100 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0x166/0x8b0 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+0xea6/0x1820 lib/xarray.c:841 page_cache_delete mm/filemap.c:138 [inline] __delete_from_page_cache+0x671/0x8c0 mm/filemap.c:239 delete_from_page_cache+0x13c/0x1a0 mm/filemap.c:274 truncate_inode_page+0x90/0xb0 mm/truncate.c:228 shmem_undo_range+0x6cf/0x1d40 mm/shmem.c:949 shmem_truncate_range mm/shmem.c:1058 [inline] shmem_evict_inode+0x21a/0xa10 mm/shmem.c:1158 evict+0x2a4/0x620 fs/inode.c:577 __dentry_kill+0x43e/0x650 fs/dcache.c:579 dentry_kill fs/dcache.c:692 [inline] dput+0x45e/0x6f0 fs/dcache.c:885 __fput+0x525/0x7a0 fs/file_table.c:293 task_work_run+0x137/0x1c0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x10b/0x1e0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x48/0x190 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880785e3340 which belongs to the cache radix_tree_node of size 576 The buggy address is located 56 bytes inside of 576-byte region [ffff8880785e3340, ffff8880785e3580) The buggy address belongs to the page: page:000000004b316ca4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x785e2 head:000000004b316ca4 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff88801084db40 raw: 0000000000000000 00000000000b000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880785e3200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880785e3280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8880785e3300: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff8880785e3380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880785e3400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================