================================================================== 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+0x206/0x220 lib/idr.c:202 Read of size 8 at addr ffff888034a530b8 by task syz-executor.5/4683 CPU: 0 PID: 4683 Comm: syz-executor.5 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+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2c6 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 radix_tree_next_slot include/linux/radix-tree.h:422 [inline] idr_for_each+0x206/0x220 lib/idr.c:202 io_ring_ctx_wait_and_kill+0x1bd/0x600 fs/io_uring.c:8767 io_uring_release+0x3e/0x50 fs/io_uring.c:8792 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc5c/0x2ae0 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: Unable to access opcode bytes at RIP 0x45e1ef. RSP: 002b:00007fff71a80cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 000000000045e219 RDX: 0000000000417b71 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000001 R08: 000000009b5ace52 R09: 0000000000000000 R10: ffffffff814b5299 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000005 R15: 0000000000000000 Allocated by task 4690: 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:401 [inline] ____kasan_kmalloc.constprop.0+0x7f/0xa0 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 mm/slab.c:3315 [inline] kmem_cache_alloc+0x1ab/0x4c0 mm/slab.c:3486 radix_tree_node_alloc.constprop.0+0x7c/0x350 lib/radix-tree.c:274 idr_get_free+0x554/0xa60 lib/radix-tree.c:1504 idr_alloc_u32+0x170/0x2d0 lib/idr.c:46 idr_alloc_cyclic+0x102/0x230 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+0x162f/0x4080 fs/io_uring.c:10114 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4701: 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:356 ____kasan_slab_free+0xb0/0xe0 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] __cache_free mm/slab.c:3424 [inline] kmem_cache_free+0x58/0x1c0 mm/slab.c:3697 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0x87/0xb0 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xbb/0x700 kernel/rcu/tree.c:3038 radix_tree_node_free lib/radix-tree.c:308 [inline] delete_node+0x591/0x8c0 lib/radix-tree.c:571 __radix_tree_delete+0x190/0x370 lib/radix-tree.c:1377 radix_tree_delete_item+0xe7/0x230 lib/radix-tree.c:1428 io_remove_personalities+0x1d/0x170 fs/io_uring.c:8712 idr_for_each+0x113/0x220 lib/idr.c:208 io_ring_ctx_wait_and_kill+0x1bd/0x600 fs/io_uring.c:8767 io_uring_release+0x3e/0x50 fs/io_uring.c:8792 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc5c/0x2ae0 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0x87/0xb0 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xbb/0x700 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+0xbcc/0x1bb0 lib/xarray.c:841 page_cache_delete_batch mm/filemap.c:337 [inline] delete_from_page_cache_batch+0xb6d/0xe20 mm/filemap.c:358 truncate_inode_pages_range+0x5b5/0x1610 mm/truncate.c:366 ext4_evict_inode+0x513/0x1940 fs/ext4/inode.c:222 evict+0x2ed/0x6b0 fs/inode.c:577 iput_final fs/inode.c:1653 [inline] iput.part.0+0x57e/0x810 fs/inode.c:1679 iput+0x58/0x70 fs/inode.c:1669 do_unlinkat+0x40b/0x660 fs/namei.c:3905 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888034a53080 which belongs to the cache radix_tree_node of size 576 The buggy address is located 56 bytes inside of 576-byte region [ffff888034a53080, ffff888034a532c0) The buggy address belongs to the page: page:000000008a4ab6c7 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888034a53ffb pfn:0x34a53 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea0001fe41c8 ffffea0001e9a6c8 ffff88801006f000 raw: ffff888034a53ffb ffff888034a53080 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888034a52f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888034a53000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888034a53080: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888034a53100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888034a53180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================