do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 ================================================================== BUG: KASAN: use-after-free in io_queue_sqe fs/io_uring.c:2523 [inline] BUG: KASAN: use-after-free in io_queue_link_head+0x323/0x3d0 fs/io_uring.c:2538 Read of size 8 at addr ffff8881eed7f3d0 by task syz-executor.0/415 CPU: 1 PID: 415 Comm: syz-executor.0 Not tainted 5.4.249-syzkaller-04712-g50533a8b511b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 io_queue_sqe fs/io_uring.c:2523 [inline] io_queue_link_head+0x323/0x3d0 fs/io_uring.c:2538 io_ring_submit fs/io_uring.c:2980 [inline] __do_sys_io_uring_enter fs/io_uring.c:3860 [inline] __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3821 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 415: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 io_get_req+0x110/0x580 fs/io_uring.c:661 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2588 io_ring_submit fs/io_uring.c:2976 [inline] __do_sys_io_uring_enter fs/io_uring.c:3860 [inline] __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3821 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 415: 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+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096 io_queue_sqe fs/io_uring.c:2522 [inline] io_queue_link_head+0x30d/0x3d0 fs/io_uring.c:2538 io_ring_submit fs/io_uring.c:2980 [inline] __do_sys_io_uring_enter fs/io_uring.c:3860 [inline] __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3821 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881eed7f380 which belongs to the cache io_kiocb of size 264 The buggy address is located 80 bytes inside of 264-byte region [ffff8881eed7f380, ffff8881eed7f488) The buggy address belongs to the page: page:ffffea0007bb5f80 refcount:1 mapcount:0 mapping:ffff8881f0f28f00 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0f28f00 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+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x109/0x250 mm/slub.c:2842 io_get_req+0x110/0x580 fs/io_uring.c:661 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2588 io_ring_submit fs/io_uring.c:2976 [inline] __do_sys_io_uring_enter fs/io_uring.c:3860 [inline] __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3821 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 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+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x7a/0x4d0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1080 [inline] nlmsg_new include/net/netlink.h:888 [inline] netlink_ack+0x2cc/0xa70 net/netlink/af_netlink.c:2414 netlink_rcv_skb+0x252/0x420 net/netlink/af_netlink.c:2486 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1347 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] __sys_sendto+0x4f3/0x6c0 net/socket.c:1942 Memory state around the buggy address: ffff8881eed7f280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881eed7f300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881eed7f380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881eed7f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881eed7f480: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================