================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1925 Read of size 8 at addr ffff8880688829e8 by task syz-executor.4/21401 CPU: 1 PID: 21401 Comm: syz-executor.4 Not tainted 4.14.194-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:183 [inline] dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1925 xmit_one net/core/dev.c:3001 [inline] dev_hard_start_xmit+0xaa/0x890 net/core/dev.c:3021 sch_direct_xmit+0x251/0x500 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3214 [inline] __dev_queue_xmit+0x1ab0/0x2480 net/core/dev.c:3489 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0x9db/0x12f0 net/ipv4/ip_output.c:229 ip_finish_output+0x37b/0xc30 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1cd/0x510 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:470 [inline] ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124 ip_queue_xmit+0x7d3/0x1a80 net/ipv4/ip_output.c:504 __tcp_transmit_skb+0x17e2/0x2cb0 net/ipv4/tcp_output.c:1133 __tcp_send_ack.part.0+0x399/0x580 net/ipv4/tcp_output.c:3645 __tcp_send_ack net/ipv4/tcp_output.c:3651 [inline] tcp_send_ack+0x6f/0x90 net/ipv4/tcp_output.c:3651 __tcp_ack_snd_check+0xf6/0x380 net/ipv4/tcp_input.c:5154 tcp_rcv_established+0x120d/0x17a0 net/ipv4/tcp_input.c:5544 tcp_v4_do_rcv+0x541/0x7d0 net/ipv4/tcp_ipv4.c:1476 tcp_v4_rcv+0x275c/0x3560 net/ipv4/tcp_ipv4.c:1750 ip_local_deliver_finish+0x3f2/0xab0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] ip_local_deliver+0x167/0x460 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:476 [inline] ip_rcv_finish+0x6e3/0x19f0 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] ip_rcv+0x8a7/0xf01 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x15ee/0x2a30 net/core/dev.c:4474 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512 netif_receive_skb_internal+0xd7/0x580 net/core/dev.c:4585 napi_skb_finish net/core/dev.c:4946 [inline] napi_gro_receive+0x2e2/0x400 net/core/dev.c:4977 receive_buf+0x101e/0x4660 drivers/net/virtio_net.c:852 virtnet_receive drivers/net/virtio_net.c:1098 [inline] virtnet_poll+0x4b7/0x960 drivers/net/virtio_net.c:1189 napi_poll net/core/dev.c:5595 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5661 __do_softirq+0x254/0xa1d kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] do_IRQ+0x112/0x1d0 arch/x86/kernel/irq.c:242 common_interrupt+0x93/0x93 arch/x86/entry/entry_64.S:576 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [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:192 RSP: 0018:ffff8881ff3b76d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff1e RAX: 1ffffffff0fa2d21 RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff888090bfcc88 RDI: 0000000000000286 RBP: ffffffff87d87140 R08: ffff888090bfc790 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: ffff888090bfc798 R14: ffff888090bfc788 R15: 0000000000000000 rcu_read_unlock_special+0x776/0xdd0 kernel/rcu/tree_plugin.h:528 __rcu_read_unlock+0x158/0x160 kernel/rcu/update.c:260 rcu_read_unlock include/linux/rcupdate.h:684 [inline] ip_route_output_key_hash+0x1b9/0x2a0 net/ipv4/route.c:2339 __ip_route_output_key include/net/route.h:126 [inline] ip_route_output_flow+0x22/0xb0 net/ipv4/route.c:2597 udp_sendmsg+0x13b5/0x1c00 net/ipv4/udp.c:1025 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x326/0x800 net/socket.c:2062 __sys_sendmmsg+0x129/0x330 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x2f/0x50 net/socket.c:2178 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d4d9 RSP: 002b:00007f64f449fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000000278c0 RCX: 000000000045d4d9 RDX: 0800000000000237 RSI: 0000000020006d00 RDI: 0000000000000004 RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000 R10: 000000001ffffffe R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fffd1107bcf R14: 00007f64f44a09c0 R15: 000000000118cf4c Allocated by task 21432: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1467 sk_alloc+0x36/0xcd0 net/core/sock.c:1521 packet_create+0xf5/0x7f0 net/packet/af_packet.c:3288 __sock_create+0x303/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 21427: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x577/0x6e0 net/core/sock.c:1582 sk_destruct net/core/sock.c:1597 [inline] __sk_free+0xd9/0x2d0 net/core/sock.c:1605 sk_free+0x2b/0x40 net/core/sock.c:1616 sock_put include/net/sock.h:1662 [inline] packet_release+0x837/0xa80 net/packet/af_packet.c:3117 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff888068882200 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2024 bytes inside of 2048-byte region [ffff888068882200, ffff888068882a00) The buggy address belongs to the page: page:ffffea0001a22080 count:1 mapcount:0 mapping:ffff888068882200 index:0xffff888068883300 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888068882200 ffff888068883300 0000000100000002 raw: ffffea00000318a0 ffffea0001985220 ffff88812fe52c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888068882880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888068882900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888068882980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888068882a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888068882a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================