SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=910 comm=syz-executor.3 ================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:193 [inline] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x87e/0xa20 net/core/dev.c:2004 Read of size 8 at addr ffff88808adb5df0 by task syz-executor.0/907 CPU: 0 PID: 907 Comm: syz-executor.0 Not tainted 4.19.141-syzkaller #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+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 __read_once_size include/linux/compiler.h:193 [inline] dev_queue_xmit_nit+0x87e/0xa20 net/core/dev.c:2004 xmit_one net/core/dev.c:3252 [inline] dev_hard_start_xmit+0xaa/0x920 net/core/dev.c:3272 sch_direct_xmit+0x2d6/0xf50 net/sched/sch_generic.c:332 qdisc_restart net/sched/sch_generic.c:395 [inline] __qdisc_run+0x4d0/0x1630 net/sched/sch_generic.c:403 qdisc_run include/net/pkt_sched.h:120 [inline] __dev_xmit_skb net/core/dev.c:3451 [inline] __dev_queue_xmit+0x2102/0x2e00 net/core/dev.c:3807 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip_finish_output2+0xb6d/0x1540 net/ipv4/ip_output.c:229 ip_finish_output+0x84d/0xcd0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:124 __ip_queue_xmit+0x866/0x1b50 net/ipv4/ip_output.c:505 __tcp_transmit_skb+0x1bb2/0x33f0 net/ipv4/tcp_output.c:1148 __tcp_send_ack.part.0+0x3d9/0x5c0 net/ipv4/tcp_output.c:3640 __tcp_send_ack net/ipv4/tcp_output.c:3646 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3646 __tcp_ack_snd_check+0x152/0x890 net/ipv4/tcp_input.c:5205 tcp_rcv_established+0x17fa/0x1e20 net/ipv4/tcp_input.c:5636 tcp_v4_do_rcv+0x5d6/0x870 net/ipv4/tcp_ipv4.c:1544 tcp_v4_rcv+0x2c03/0x3b80 net/ipv4/tcp_ipv4.c:1829 ip_local_deliver_finish+0x495/0xc00 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x188/0x500 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1ca/0x2e0 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xca/0x3c0 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 netif_receive_skb_internal+0xf0/0x3f0 net/core/dev.c:5156 napi_skb_finish net/core/dev.c:5600 [inline] napi_gro_receive+0x2e6/0x450 net/core/dev.c:5631 receive_buf+0xefc/0x5e50 drivers/net/virtio_net.c:1072 virtnet_receive drivers/net/virtio_net.c:1336 [inline] virtnet_poll+0x568/0xd70 drivers/net/virtio_net.c:1441 napi_poll net/core/dev.c:6271 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6337 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] do_IRQ+0x10c/0x1c0 arch/x86/kernel/irq.c:258 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:670 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 48 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d 2c e1 94 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 ca e4 c2 f9 eb c0 0f 0b 0f 0b 48 c7 c7 48 RSP: 0018:ffff8880521af5f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd5 RAX: 1ffffffff11a4b69 RBX: 0000000000000286 RCX: 1ffff1100afaf98d RDX: dffffc0000000000 RSI: ffff888057d7cc70 RDI: 0000000000000286 RBP: ffffffff88d95b00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888057d7c3c0 R13: ffffffff88d95bc0 R14: 0000000000000000 R15: ffffffff88d95b00 rcu_read_unlock_special+0x7ce/0xfc0 kernel/rcu/tree_plugin.h:587 __rcu_read_unlock+0x158/0x160 kernel/rcu/tree_plugin.h:428 rcu_read_unlock include/linux/rcupdate.h:680 [inline] netlink_deliver_tap+0x237/0xb00 net/netlink/af_netlink.c:336 __netlink_sendskb net/netlink/af_netlink.c:1262 [inline] netlink_sendskb+0x6c/0x110 net/netlink/af_netlink.c:1271 netlink_unicast+0x5b3/0x690 net/netlink/af_netlink.c:1359 netlink_ack+0x628/0xae0 net/netlink/af_netlink.c:2425 netlink_rcv_skb+0x353/0x440 net/netlink/af_netlink.c:2461 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416fe1 Code: 75 14 b8 2e 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 19 00 00 c3 48 83 ec 08 e8 ea fa ff ff 48 89 04 24 b8 2e 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fab3f2cc9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fab3f2cca40 RCX: 0000000000416fe1 RDX: 0000000000000000 RSI: 00007fab3f2cca00 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000006 R13: 00007ffdca2a4eff R14: 00007fab3f2cd9c0 R15: 000000000118cf4c Allocated by task 905: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466 sk_alloc+0x36/0xec0 net/core/sock.c:1520 packet_create+0x117/0x850 net/packet/af_packet.c:3252 __sock_create+0x3d8/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 900: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 sk_prot_free net/core/sock.c:1503 [inline] __sk_destruct+0x5ff/0x810 net/core/sock.c:1584 sk_destruct net/core/sock.c:1599 [inline] __sk_free+0x165/0x3b0 net/core/sock.c:1610 sk_free+0x3b/0x50 net/core/sock.c:1621 sock_put include/net/sock.h:1711 [inline] packet_release+0x890/0xb70 net/packet/af_packet.c:3081 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808adb5600 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2032 bytes inside of 2048-byte region [ffff88808adb5600, ffff88808adb5e00) The buggy address belongs to the page: page:ffffea00022b6d00 count:1 mapcount:0 mapping:ffff88812c39cc40 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea0001541f88 ffffea0000c7b208 ffff88812c39cc40 raw: 0000000000000000 ffff88808adb4500 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808adb5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808adb5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808adb5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808adb5e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808adb5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================