================================================================== 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 ffff88802f6da2f8 by task syz-executor.1/10034 CPU: 1 PID: 10034 Comm: syz-executor.1 Not tainted 5.11.0-rc6-next-20210202-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:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 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+0x104/0x600 fs/io_uring.c:8844 io_uring_release+0x3e/0x50 fs/io_uring.c:8879 __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 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 Code: Unable to access opcode bytes at RIP 0x465adf. RSP: 002b:00007fe2450ab218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056c010 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056c010 RBP: 000000000056c008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c014 R13: 00007ffdd7c0cf1f R14: 00007fe2450ab300 R15: 0000000000022000 Allocated by task 10034: 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:427 [inline] __kasan_slab_alloc+0x75/0x90 mm/kasan/common.c:460 kasan_slab_alloc include/linux/kasan.h:223 [inline] slab_post_alloc_hook mm/slab.h:516 [inline] slab_alloc_node mm/slub.c:2907 [inline] slab_alloc mm/slub.c:2915 [inline] kmem_cache_alloc+0x15e/0x380 mm/slub.c:2920 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:9936 [inline] __io_uring_register fs/io_uring.c:10150 [inline] __do_sys_io_uring_register+0x1408/0x3fb0 fs/io_uring.c:10200 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 18: 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:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kmem_cache_free+0x8b/0x740 mm/slub.c:3177 rcu_do_batch kernel/rcu/tree.c:2507 [inline] rcu_core+0x746/0x1390 kernel/rcu/tree.c:2742 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0xbb/0x750 kernel/rcu/tree.c:3062 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_unregister_personality+0x1c/0x190 fs/io_uring.c:8789 io_remove_personalities+0x19/0x20 fs/io_uring.c:8804 idr_for_each+0x113/0x220 lib/idr.c:208 io_ring_ctx_wait_and_kill+0x104/0x600 fs/io_uring.c:8844 io_uring_release+0x3e/0x50 fs/io_uring.c:8879 __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 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88802f6da2c0 which belongs to the cache radix_tree_node of size 576 The buggy address is located 56 bytes inside of 576-byte region [ffff88802f6da2c0, ffff88802f6da500) The buggy address belongs to the page: page:000000002bbb353f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f6da head:000000002bbb353f order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88801084db40 raw: 0000000000000000 00000000800b000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802f6da180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802f6da200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88802f6da280: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88802f6da300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802f6da380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================