==================================================================
BUG: KASAN: use-after-free in deliver_ptype_list_skb net/core/dev.c:1871 [inline]
BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 net/core/dev.c:4406
Read of size 2 at addr ffff8801c5676b40 by task syzkaller032978/7329

CPU: 0 PID: 7329 Comm: syzkaller032978 Not tainted 4.13.0-mm1+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x24e/0x340 mm/kasan/report.c:409
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
 deliver_ptype_list_skb net/core/dev.c:1871 [inline]
 __netif_receive_skb_core+0x2be3/0x33d0 net/core/dev.c:4406
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4461
 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4534
 napi_skb_finish net/core/dev.c:4895 [inline]
 napi_gro_receive+0x3d0/0x500 net/core/dev.c:4926
 receive_buf+0xcc5/0x51f0 drivers/net/virtio_net.c:841
 virtnet_receive drivers/net/virtio_net.c:1087 [inline]
 virtnet_poll+0x304/0xad0 drivers/net/virtio_net.c:1168
 napi_poll net/core/dev.c:5537 [inline]
 net_rx_action+0x792/0x1910 net/core/dev.c:5603
 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 do_IRQ+0xf6/0x190 arch/x86/kernel/irq.c:253
 common_interrupt+0x9d/0x9d arch/x86/entry/entry_64.S:598
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba kernel/locking/spinlock.c:191
RSP: 0018:ffff8801c5bb79c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff6e
RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000
RDX: 1ffffffff0b592fd RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff8801c5bb79d0 R08: 1ffff1003b3f1473 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c54967d0
R13: ffff8801db325c00 R14: ffff8801c5bb7ac0 R15: ffff8801db325c18
 task_rq_unlock kernel/sched/sched.h:1707 [inline]
 wake_up_new_task+0x62b/0xc00 kernel/sched/core.c:2475
 _do_fork+0x296/0xfe0 kernel/fork.c:2052
 SYSC_clone kernel/fork.c:2138 [inline]
 SyS_clone+0x37/0x50 kernel/fork.c:2132
 do_syscall_64+0x26c/0x8c0 arch/x86/entry/common.c:287
 entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x449159
RSP: 002b:00007ffcf41ad338 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f5b7b008700 RCX: 0000000000449159
RDX: 00007f5b7b0089d0 RSI: 00007f5b7b007db0 RDI: 00000000003d0f00
RBP: 00007ffcf41ad3f0 R08: 00007f5b7b008700 R09: 00007f5b7b008700
R10: 00007f5b7b0089d0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffcf41ad3ef R14: 00007f5b7b0089c0 R15: 0000000000000000

Allocated by task 7313:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 fanout_add+0xa50/0x1190 net/packet/af_packet.c:1733
 packet_setsockopt+0xfdc/0x1e80 net/packet/af_packet.c:3795
 SYSC_setsockopt net/socket.c:1852 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1831
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 7233:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xca/0x250 mm/slab.c:3820
 packet_release+0xa8f/0xd70 net/packet/af_packet.c:3033
 sock_release+0x8d/0x1e0 net/socket.c:597
 sock_close+0x16/0x20 net/socket.c:1126
 __fput+0x333/0x7f0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:112
 exit_task_work include/linux/task_work.h:21 [inline]
 do_exit+0xa52/0x1b40 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801c56762c0
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 2176 bytes inside of
 4096-byte region [ffff8801c56762c0, ffff8801c56772c0)
The buggy address belongs to the page:
page:ffffea0007159d80 count:1 mapcount:0 mapping:ffff8801c56762c0 index:0x0 compound_mapcount: 0
flags: 0x200000000008100(slab|head)
raw: 0200000000008100 ffff8801c56762c0 0000000000000000 0000000100000001
raw: ffffea00071575a0 ffffea000715b1a0 ffff8801dac00dc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c5676a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c5676a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c5676b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^