================================================================== BUG: KASAN: use-after-free in io_queue_sqe fs/io_uring.c:2513 [inline] BUG: KASAN: use-after-free in io_queue_link_head+0x37a/0x5c0 fs/io_uring.c:2528 Read of size 8 at addr ffff8881ec04add0 by task syz-executor.5/6582 CPU: 1 PID: 6582 Comm: syz-executor.5 Not tainted 5.4.91-syzkaller-00438-g15cec007c4a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1dd/0x24e lib/dump_stack.c:118 print_address_description+0x96/0x640 mm/kasan/report.c:374 __kasan_report+0x177/0x1f0 mm/kasan/report.c:506 kasan_report+0x30/0x60 mm/kasan/common.c:634 io_queue_sqe fs/io_uring.c:2513 [inline] io_queue_link_head+0x37a/0x5c0 fs/io_uring.c:2528 io_ring_submit fs/io_uring.c:2970 [inline] __do_sys_io_uring_enter fs/io_uring.c:3852 [inline] __se_sys_io_uring_enter+0xbd1/0x1df0 fs/io_uring.c:3813 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff6d0876c68 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000003 RBP: 00007ff6d0876ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fff74ce8c7f R14: 00007ff6d08779c0 R15: 000000000119bf8c Allocated by task 6582: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x129/0x1c0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2803 [inline] slab_alloc mm/slub.c:2811 [inline] kmem_cache_alloc+0x1e0/0x270 mm/slub.c:2816 io_get_req+0x11b/0x5c0 fs/io_uring.c:644 io_submit_sqe+0x83/0xe90 fs/io_uring.c:2578 io_ring_submit fs/io_uring.c:2966 [inline] __do_sys_io_uring_enter fs/io_uring.c:3852 [inline] __se_sys_io_uring_enter+0x8b6/0x1df0 fs/io_uring.c:3813 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 6582: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x17e/0x230 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x610 mm/slub.c:3067 io_queue_sqe fs/io_uring.c:2512 [inline] io_queue_link_head+0x364/0x5c0 fs/io_uring.c:2528 io_ring_submit fs/io_uring.c:2970 [inline] __do_sys_io_uring_enter fs/io_uring.c:3852 [inline] __se_sys_io_uring_enter+0xbd1/0x1df0 fs/io_uring.c:3813 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881ec04ad80 which belongs to the cache io_kiocb of size 264 The buggy address is located 80 bytes inside of 264-byte region [ffff8881ec04ad80, ffff8881ec04ae88) The buggy address belongs to the page: page:ffffea0007b01280 refcount:1 mapcount:0 mapping:ffff8881f4133b80 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f4133b80 raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ec04ac80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ec04ad00: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881ec04ad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ec04ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ec04ae80: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================