================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:220 [inline] BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:702 [inline] BUG: KASAN: use-after-free in hlist_del_init include/linux/list.h:717 [inline] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x977/0xa00 net/xfrm/xfrm_policy.c:2213 Write of size 8 at addr ffff8880912fa868 by task syz-executor0/31725 CPU: 0 PID: 31725 Comm: syz-executor0 Not tainted 5.0.0-rc3+ #24 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140 __write_once_size include/linux/compiler.h:220 [inline] __hlist_del include/linux/list.h:702 [inline] hlist_del_init include/linux/list.h:717 [inline] __xfrm_policy_unlink+0x977/0xa00 net/xfrm/xfrm_policy.c:2213 xfrm_policy_flush+0x331/0x460 net/xfrm/xfrm_policy.c:1789 xfrm_flush_policy+0x166/0x470 net/xfrm/xfrm_user.c:2129 xfrm_user_rcv_msg+0x458/0x8d0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f41c508ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f41c508f6d4 R13: 00000000004c568f R14: 00000000004d9400 R15: 00000000ffffffff Allocated by task 7579: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 __do_kmalloc_node mm/slab.c:3673 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3687 __kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:140 __alloc_skb+0x12d/0x730 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1011 [inline] __tcp_send_ack.part.0+0x6a/0x5b0 net/ipv4/tcp_output.c:3628 __tcp_send_ack net/ipv4/tcp_output.c:3655 [inline] tcp_send_ack+0x88/0xa0 net/ipv4/tcp_output.c:3655 tcp_cleanup_rbuf+0x246/0x790 net/ipv4/tcp.c:1582 tcp_recvmsg+0xa30/0x3270 net/ipv4/tcp.c:2160 inet_recvmsg+0x17b/0x6d0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg net/socket.c:801 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:797 sock_read_iter+0x3ba/0x5a0 net/socket.c:878 call_read_iter include/linux/fs.h:1856 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x761/0xb20 fs/read_write.c:418 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0x105/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 29812: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 skb_free_head+0x93/0xb0 net/core/skbuff.c:553 skb_release_data+0x6ea/0x970 net/core/skbuff.c:573 skb_release_all+0x4d/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb net/core/skbuff.c:701 [inline] consume_skb+0x18c/0x550 net/core/skbuff.c:695 __dev_kfree_skb_any+0xa4/0xd0 net/core/dev.c:2813 dev_consume_skb_any include/linux/netdevice.h:3594 [inline] napi_consume_skb+0x56e/0x720 net/core/skbuff.c:765 free_old_xmit_skbs+0xe8/0x220 drivers/net/virtio_net.c:1347 start_xmit+0x1b6/0x17d0 drivers/net/virtio_net.c:1518 __netdev_start_xmit include/linux/netdevice.h:4385 [inline] netdev_start_xmit include/linux/netdevice.h:4394 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x261/0xc70 net/core/dev.c:3294 sch_direct_xmit+0x452/0x1100 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x606/0x19d0 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:121 [inline] qdisc_run include/net/pkt_sched.h:118 [inline] __dev_xmit_skb net/core/dev.c:3473 [inline] __dev_queue_xmit+0x29d0/0x3a60 net/core/dev.c:3832 dev_queue_xmit+0x18/0x20 net/core/dev.c:3897 neigh_hh_output include/net/neighbour.h:498 [inline] neigh_output include/net/neighbour.h:506 [inline] ip_finish_output2+0x11f1/0x1a00 net/ipv4/ip_output.c:229 ip_finish_output+0x7e4/0xf60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x226/0x880 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc4/0x1b0 net/ipv4/ip_output.c:124 __ip_queue_xmit+0x99a/0x1ee0 net/ipv4/ip_output.c:505 ip_queue_xmit+0x5a/0x70 include/net/ip.h:198 __tcp_transmit_skb+0x1ae2/0x3ab0 net/ipv4/tcp_output.c:1156 __tcp_send_ack.part.0+0x3c6/0x5b0 net/ipv4/tcp_output.c:3649 __tcp_send_ack net/ipv4/tcp_output.c:3655 [inline] tcp_send_ack+0x88/0xa0 net/ipv4/tcp_output.c:3655 __tcp_ack_snd_check+0x1df/0xac0 net/ipv4/tcp_input.c:5192 tcp_ack_snd_check net/ipv4/tcp_input.c:5238 [inline] tcp_rcv_established+0xa52/0x2180 net/ipv4/tcp_input.c:5659 tcp_v4_do_rcv+0x616/0x8d0 net/ipv4/tcp_ipv4.c:1538 tcp_v4_rcv+0x3151/0x3c40 net/ipv4/tcp_ipv4.c:1912 ip_protocol_deliver_rcu+0xb6/0xa20 net/ipv4/ip_input.c:208 ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:234 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_local_deliver+0x1f0/0x740 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f4/0x2f0 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_rcv+0xed/0x620 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x160/0x210 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 netif_receive_skb_internal+0x11e/0x690 net/core/dev.c:5186 napi_skb_finish net/core/dev.c:5665 [inline] napi_gro_receive+0x79a/0x9b0 net/core/dev.c:5698 receive_buf+0xae1/0x31f0 drivers/net/virtio_net.c:1043 virtnet_receive drivers/net/virtio_net.c:1305 [inline] virtnet_poll+0x59e/0x104f drivers/net/virtio_net.c:1392 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x76d/0x1930 net/core/dev.c:6412 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 The buggy address belongs to the object at ffff8880912fa4c0 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 936 bytes inside of 1024-byte region [ffff8880912fa4c0, ffff8880912fa8c0) The buggy address belongs to the page: page:ffffea000244be80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0xffff8880912fadc0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002359208 ffffea000237b388 ffff88812c3f0ac0 raw: ffff8880912fadc0 ffff8880912fa040 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880912fa700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880912fa780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880912fa800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880912fa880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880912fa900: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================