================================================================== 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 ffff888031e62038 by task syz-executor.4/16518 CPU: 0 PID: 16518 Comm: syz-executor.4 Not tainted 5.11.0-rc5-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/0x2f8 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:8795 io_uring_release+0x3e/0x50 fs/io_uring.c:8820 __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] __ia32_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f37549 Code: Unable to access opcode bytes at RIP 0xf7f3751f. RSP: 002b:00000000090bfd5c EFLAGS: 00000206 ORIG_RAX: 00000000000000fc RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000032 RSI: 0000000000000000 RDI: 000000000805c3db RBP: 00000000fffffff7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 16520: 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+0x82/0xa0 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_node mm/slub.c:2892 [inline] slab_alloc mm/slub.c:2900 [inline] kmem_cache_alloc+0x1c6/0x440 mm/slub.c:2905 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:9873 [inline] __io_uring_register fs/io_uring.c:10102 [inline] __do_sys_io_uring_register+0x1639/0x4090 fs/io_uring.c:10152 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 8465: 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+0xe1/0x110 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+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3159 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+0xc5/0xf0 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:8740 idr_for_each+0x113/0x220 lib/idr.c:208 io_ring_ctx_wait_and_kill+0x1bd/0x600 fs/io_uring.c:8795 io_uring_release+0x3e/0x50 fs/io_uring.c:8820 __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] __ia32_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 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 inotify_remove_from_idr+0x110/0x450 fs/notify/inotify/inotify_user.c:480 inotify_ignored_and_remove_idr+0x2f/0x70 fs/notify/inotify/inotify_user.c:505 fsnotify_free_mark+0xe5/0x140 fs/notify/mark.c:427 fsnotify_clear_marks_by_group+0x340/0x490 fs/notify/mark.c:763 fsnotify_destroy_group+0xc9/0x300 fs/notify/group.c:61 inotify_release+0x46/0x80 fs/notify/inotify/inotify_user.c:282 __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 get_signal+0x427/0x20f0 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 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+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 __do_fast_syscall_32+0x62/0x80 arch/x86/entry/common.c:142 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff888031e62000 which belongs to the cache radix_tree_node of size 576 The buggy address is located 56 bytes inside of 576-byte region [ffff888031e62000, ffff888031e62240) The buggy address belongs to the page: page:0000000059fdfd47 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31e62 head:0000000059fdfd47 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 ffffea0000c51880 0000000800000008 ffff88801004db40 raw: 0000000000000000 00000000000b000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888031e61f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888031e61f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888031e62000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888031e62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888031e62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================