================================================================== BUG: KASAN: use-after-free in io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221 Write of size 8 at addr ffff88801c67d880 by task syz-executor.4/19617 CPU: 0 PID: 19617 Comm: syz-executor.4 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221 io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873 io_queue_sqe_fallback+0x155/0x190 io_uring/io_uring.c:1936 io_submit_state_end io_uring/io_uring.c:2177 [inline] io_submit_sqes+0x18bd/0x1df0 io_uring/io_uring.c:2291 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fadafa8a669 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fadb0c39168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007fadafbac120 RCX: 00007fadafa8a669 RDX: 0000000000000000 RSI: 0000000000006905 RDI: 0000000000000005 RBP: 00007fadafae5560 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff519ef31f R14: 00007fadb0c39300 R15: 0000000000022000 Allocated by task 19617: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:934 [inline] __kmalloc+0x54/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590 io_msg_alloc_async io_uring/net.c:138 [inline] io_msg_alloc_async_prep io_uring/net.c:147 [inline] io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221 io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613 io_queue_sqe_fallback+0xd3/0x190 io_uring/io_uring.c:1933 io_submit_state_end io_uring/io_uring.c:2177 [inline] io_submit_sqes+0x18bd/0x1df0 io_uring/io_uring.c:2291 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 19617: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 io_sendrecv_fail+0x2a4/0x3e0 io_uring/net.c:1220 io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873 io_queue_sqe_fallback+0x155/0x190 io_uring/io_uring.c:1936 io_submit_state_end io_uring/io_uring.c:2177 [inline] io_submit_sqes+0x18bd/0x1df0 io_uring/io_uring.c:2291 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x99/0x820 kernel/rcu/tree.c:2796 inetdev_destroy net/ipv4/devinet.c:331 [inline] inetdev_event+0xd4a/0x1610 net/ipv4/devinet.c:1602 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] unregister_netdevice_many+0xaef/0x1a40 net/core/dev.c:10860 ip_tunnel_delete_nets+0x39f/0x5b0 net/ipv4/ip_tunnel.c:1126 ops_exit_list+0x125/0x170 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88801c67d800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 128 bytes inside of 512-byte region [ffff88801c67d800, ffff88801c67da00) The buggy address belongs to the physical page: page:ffffea0000719f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea0001f6fc00 pfn:0x1c67c head:ffffea0000719f00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011841c80 dead000080100010 0000000000000000 raw: ffffea0001f6fc00 dead000000000002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 22, tgid 22 (ksoftirqd/1), ts 58932080106, free_ts 33169431439 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 __do_kmalloc_node mm/slab_common.c:933 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:954 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434 __napi_alloc_skb+0x93/0x340 net/core/skbuff.c:575 napi_alloc_skb include/linux/skbuff.h:3208 [inline] page_to_skb+0x17d/0xc80 drivers/net/virtio_net.c:496 receive_mergeable drivers/net/virtio_net.c:1119 [inline] receive_buf+0xe0a/0x5560 drivers/net/virtio_net.c:1258 virtnet_receive drivers/net/virtio_net.c:1553 [inline] virtnet_poll+0x708/0x1310 drivers/net/virtio_net.c:1671 __napi_poll+0xb8/0x770 net/core/dev.c:6511 napi_poll net/core/dev.c:6578 [inline] net_rx_action+0x9fc/0xde0 net/core/dev.c:6689 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482 __folio_put_large mm/swap.c:118 [inline] __folio_put+0x105/0x130 mm/swap.c:126 folio_put include/linux/mm.h:1159 [inline] put_page include/linux/mm.h:1211 [inline] __skb_frag_unref include/linux/skbuff.h:3381 [inline] skb_release_data+0x51e/0x870 net/core/skbuff.c:685 skb_release_all net/core/skbuff.c:756 [inline] napi_consume_skb net/core/skbuff.c:1013 [inline] napi_consume_skb+0x145/0x280 net/core/skbuff.c:991 skb_defer_free_flush net/core/dev.c:6659 [inline] net_rx_action+0x342/0xde0 net/core/dev.c:6680 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 Memory state around the buggy address: ffff88801c67d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801c67d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801c67d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c67d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801c67d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================