RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f1f567f02f9 RDX: 0000000000000000 RSI: 00000000000022ff RDI: 0000000000000003 RBP: 00007ffe67ed6540 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 ================================================================== BUG: KASAN: use-after-free in io_queue_link_head+0x56f/0x680 fs/io_uring.c:2550 Read of size 8 at addr ffff8881e0a087d0 by task syz-executor960/306 CPU: 0 PID: 306 Comm: syz-executor960 Not tainted 5.4.197-syzkaller-00010-gccdf6bdf62a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18e/0x1d5 lib/dump_stack.c:118 print_address_description+0x8c/0x630 mm/kasan/report.c:384 __kasan_report+0xf6/0x130 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 io_queue_link_head+0x56f/0x680 fs/io_uring.c:2550 io_ring_submit fs/io_uring.c:2979 [inline] __do_sys_io_uring_enter fs/io_uring.c:3861 [inline] __se_sys_io_uring_enter+0xb09/0x1cb0 fs/io_uring.c:3822 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f1f567f02f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe67ed6518 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f1f567f02f9 RDX: 0000000000000000 RSI: 00000000000022ff RDI: 0000000000000003 RBP: 00007ffe67ed6540 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 Allocated by task 306: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] kmem_cache_alloc_bulk+0x16f/0x270 mm/slub.c:3291 io_get_req+0x17a/0x590 fs/io_uring.c:668 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2587 io_ring_submit fs/io_uring.c:2975 [inline] __do_sys_io_uring_enter fs/io_uring.c:3861 [inline] __se_sys_io_uring_enter+0x7cf/0x1cb0 fs/io_uring.c:3822 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 306: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x178/0x240 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kmem_cache_free+0xa9/0x1d0 mm/slub.c:3096 io_queue_link_head+0x2b7/0x680 fs/io_uring.c:2548 io_ring_submit fs/io_uring.c:2979 [inline] __do_sys_io_uring_enter fs/io_uring.c:3861 [inline] __se_sys_io_uring_enter+0xb09/0x1cb0 fs/io_uring.c:3822 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881e0a08780 which belongs to the cache io_kiocb of size 264 The buggy address is located 80 bytes inside of 264-byte region [ffff8881e0a08780, ffff8881e0a08888) The buggy address belongs to the page: page:ffffea0007828200 refcount:1 mapcount:0 mapping:ffff8881f5e5aa00 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5e5aa00 raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x194/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857 alloc_slab_page+0x39/0x3e0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x450 mm/slub.c:1749 new_slab_objects mm/slub.c:2506 [inline] ___slab_alloc+0x320/0x4b0 mm/slub.c:2667 kmem_cache_alloc_bulk+0xc6/0x270 mm/slub.c:3265 io_get_req+0x17a/0x590 fs/io_uring.c:668 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2587 io_ring_submit fs/io_uring.c:2975 [inline] __do_sys_io_uring_enter fs/io_uring.c:3861 [inline] __se_sys_io_uring_enter+0x7cf/0x1cb0 fs/io_uring.c:3822 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x7ee/0x920 mm/page_alloc.c:1438 put_page include/linux/mm.h:1150 [inline] page_to_skb+0x62e/0x910 drivers/net/virtio_net.c:433 receive_mergeable+0x73e/0x2300 drivers/net/virtio_net.c:977 receive_buf+0x104/0x1940 drivers/net/virtio_net.c:1087 virtnet_receive drivers/net/virtio_net.c:1379 [inline] virtnet_poll+0x554/0x10b0 drivers/net/virtio_net.c:1484 napi_poll+0x195/0x670 net/core/dev.c:6352 net_rx_action+0x2dd/0x890 net/core/dev.c:6420 __do_softirq+0x23e/0x643 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:538 [inline] do_IRQ+0xc4/0x1b0 arch/x86/kernel/irq.c:263 ret_from_intr+0x0/0x14 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] default_idle+0x1f/0x30 arch/x86/kernel/process.c:572 default_idle_call kernel/sched/idle.c:94 [inline] cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1d2/0x590 kernel/sched/idle.c:264 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:356 start_secondary+0x312/0x390 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 Memory state around the buggy address: ffff8881e0a08680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881e0a08700: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881e0a08780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e0a08800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e0a08880: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================