================================================================== 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+0xcf/0x250 lib/idr.c:202 Read of size 8 at addr ffff888032afc618 by task syz-executor.0/18923 CPU: 1 PID: 18923 Comm: syz-executor.0 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+0x137/0x1be lib/dump_stack.c:120 print_address_description+0x5f/0x3a0 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+0xcf/0x250 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+0x6e4/0x2380 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x1734/0x1ef0 kernel/signal.c:2773 arch_do_signal_or_restart+0x3c/0x610 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:00007f5c03614cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000119c030 RCX: 000000000045e219 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000119c034 RBP: 000000000119c028 R08: 000000000000000e R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffe96a56f5f R14: 00007f5c036159c0 R15: 000000000119c034 Allocated by task 18912: 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+0x16f/0x530 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+0xd9c/0x2960 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 18924: 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+0x7db/0x10c0 kernel/rcu/tree.c:2723 __do_softirq+0x318/0x714 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+0x10f/0x800 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+0x15d/0x250 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+0x6e4/0x2380 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x1734/0x1ef0 kernel/signal.c:2773 arch_do_signal_or_restart+0x3c/0x610 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+0x10f/0x800 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 free_pid+0x1ac/0x280 kernel/pid.c:152 __unhash_process kernel/exit.c:78 [inline] __exit_signal kernel/exit.c:148 [inline] release_task+0xb99/0x1320 kernel/exit.c:199 wait_task_zombie kernel/exit.c:1107 [inline] wait_consider_task+0x19e4/0x2f00 kernel/exit.c:1334 do_wait_thread kernel/exit.c:1397 [inline] do_wait+0x2d1/0x700 kernel/exit.c:1468 kernel_wait4+0x1d1/0x2c0 kernel/exit.c:1630 __do_sys_wait4 kernel/exit.c:1658 [inline] __se_sys_wait4 kernel/exit.c:1654 [inline] __x64_sys_wait4+0xc3/0x150 kernel/exit.c:1654 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 ffff888032afc580 which belongs to the cache radix_tree_node of size 576 The buggy address is located 152 bytes inside of 576-byte region [ffff888032afc580, ffff888032afc7c0) The buggy address belongs to the page: page:000000006fb39558 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32afc head:000000006fb39558 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88801044db40 raw: 0000000000000000 00000000800b000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888032afc500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888032afc580: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888032afc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888032afc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032afc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================