==================================================================
BUG: KASAN: use-after-free in ____bpf_clone_redirect net/core/filter.c:1768 [inline]
BUG: KASAN: use-after-free in bpf_clone_redirect+0x2a7/0x2b0 net/core/filter.c:1759
Read of size 8 at addr ffff8881a4820850 by task syz-executor.4/31776

CPU: 1 PID: 31776 Comm: syz-executor.4 Not tainted 4.14.149+ #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 ____bpf_clone_redirect net/core/filter.c:1768 [inline]
 bpf_clone_redirect+0x2a7/0x2b0 net/core/filter.c:1759
 ___bpf_prog_run+0x2478/0x5510 kernel/bpf/core.c:1095

Allocated by task 30534:
 save_stack mm/kasan/common.c:76 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc.part.0+0x53/0xc0 mm/kasan/common.c:501
 slab_post_alloc_hook mm/slab.h:439 [inline]
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2800 [inline]
 kmem_cache_alloc+0xee/0x360 mm/slub.c:2805
 skb_clone+0x124/0x370 net/core/skbuff.c:1282
 dev_queue_xmit_nit+0x2f3/0x970 net/core/dev.c:1943
 xmit_one net/core/dev.c:3005 [inline]
 dev_hard_start_xmit+0xa3/0x8c0 net/core/dev.c:3025
 __dev_queue_xmit+0x11e0/0x1d00 net/core/dev.c:3525
 neigh_hh_output include/net/neighbour.h:490 [inline]
 neigh_output include/net/neighbour.h:498 [inline]
 ip6_finish_output2+0xcd0/0x1fa0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x64b/0xb40 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1dc/0x680 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:462 [inline]
 ip6_local_out+0x98/0x170 net/ipv6/output_core.c:178
 ip6_send_skb+0x9b/0x2f0 net/ipv6/ip6_output.c:1688
 ip6_push_pending_frames+0xaf/0xd0 net/ipv6/ip6_output.c:1708
 icmpv6_push_pending_frames+0x328/0x520 net/ipv6/icmp.c:289
 icmp6_send+0x1627/0x1cc0 net/ipv6/icmp.c:588
 icmpv6_send+0xa8/0x1a0 net/ipv6/ip6_icmp.c:43
 ip6_link_failure+0x24/0x430 net/ipv6/route.c:1438
 dst_link_failure include/net/dst.h:445 [inline]
 vti6_xmit net/ipv6/ip6_vti.c:522 [inline]
 vti6_tnl_xmit+0xa3a/0x1660 net/ipv6/ip6_vti.c:561
 __netdev_start_xmit include/linux/netdevice.h:4033 [inline]
 netdev_start_xmit include/linux/netdevice.h:4042 [inline]
 xmit_one net/core/dev.c:3009 [inline]
 dev_hard_start_xmit+0x19f/0x8c0 net/core/dev.c:3025
 __dev_queue_xmit+0x11e0/0x1d00 net/core/dev.c:3525
 neigh_output include/net/neighbour.h:500 [inline]
 ip6_finish_output2+0x1018/0x1fa0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x64b/0xb40 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1dc/0x680 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:462 [inline]
 ip6_local_out+0x98/0x170 net/ipv6/output_core.c:178
 ip6_send_skb+0x9b/0x2f0 net/ipv6/ip6_output.c:1688
 udp_v6_send_skb+0x4e2/0xe80 net/ipv6/udp.c:1081
 udpv6_sendmsg+0x1dfd/0x2500 net/ipv6/udp.c:1353
 inet_sendmsg+0x15b/0x520 net/ipv4/af_inet.c:760
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb7/0x100 net/socket.c:656
 ___sys_sendmsg+0x368/0x890 net/socket.c:2062
 __sys_sendmmsg+0x13c/0x360 net/socket.c:2152
 SYSC_sendmmsg net/socket.c:2183 [inline]
 SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
 0xffffffffffffffff

Freed by task 30534:
 save_stack mm/kasan/common.c:76 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x164/0x210 mm/kasan/common.c:463
 slab_free_hook mm/slub.c:1407 [inline]
 slab_free_freelist_hook mm/slub.c:1458 [inline]
 slab_free mm/slub.c:3039 [inline]
 kmem_cache_free+0xd7/0x3b0 mm/slub.c:3055
 kfree_skbmem net/core/skbuff.c:586 [inline]
 kfree_skbmem+0xa0/0x110 net/core/skbuff.c:580
 __kfree_skb net/core/skbuff.c:646 [inline]
 consume_skb+0xe4/0x360 net/core/skbuff.c:705
 packet_rcv+0xdf/0x1290 net/packet/af_packet.c:2178
 dev_queue_xmit_nit+0x6e1/0x970 net/core/dev.c:1975
 xmit_one net/core/dev.c:3005 [inline]
 dev_hard_start_xmit+0xa3/0x8c0 net/core/dev.c:3025
 __dev_queue_xmit+0x11e0/0x1d00 net/core/dev.c:3525
 neigh_hh_output include/net/neighbour.h:490 [inline]
 neigh_output include/net/neighbour.h:498 [inline]
 ip6_finish_output2+0xcd0/0x1fa0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x64b/0xb40 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1dc/0x680 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:462 [inline]
 ip6_local_out+0x98/0x170 net/ipv6/output_core.c:178
 ip6_send_skb+0x9b/0x2f0 net/ipv6/ip6_output.c:1688
 ip6_push_pending_frames+0xaf/0xd0 net/ipv6/ip6_output.c:1708
 icmpv6_push_pending_frames+0x328/0x520 net/ipv6/icmp.c:289
 icmp6_send+0x1627/0x1cc0 net/ipv6/icmp.c:588
 icmpv6_send+0xa8/0x1a0 net/ipv6/ip6_icmp.c:43
 ip6_link_failure+0x24/0x430 net/ipv6/route.c:1438
 dst_link_failure include/net/dst.h:445 [inline]
 vti6_xmit net/ipv6/ip6_vti.c:522 [inline]
 vti6_tnl_xmit+0xa3a/0x1660 net/ipv6/ip6_vti.c:561
 __netdev_start_xmit include/linux/netdevice.h:4033 [inline]
 netdev_start_xmit include/linux/netdevice.h:4042 [inline]
 xmit_one net/core/dev.c:3009 [inline]
 dev_hard_start_xmit+0x19f/0x8c0 net/core/dev.c:3025
 __dev_queue_xmit+0x11e0/0x1d00 net/core/dev.c:3525
 neigh_output include/net/neighbour.h:500 [inline]
 ip6_finish_output2+0x1018/0x1fa0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x64b/0xb40 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1dc/0x680 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:462 [inline]
 ip6_local_out+0x98/0x170 net/ipv6/output_core.c:178
 ip6_send_skb+0x9b/0x2f0 net/ipv6/ip6_output.c:1688
 udp_v6_send_skb+0x4e2/0xe80 net/ipv6/udp.c:1081
 udpv6_sendmsg+0x1dfd/0x2500 net/ipv6/udp.c:1353
 inet_sendmsg+0x15b/0x520 net/ipv4/af_inet.c:760
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb7/0x100 net/socket.c:656
 ___sys_sendmsg+0x368/0x890 net/socket.c:2062
 __sys_sendmmsg+0x13c/0x360 net/socket.c:2152
 SYSC_sendmmsg net/socket.c:2183 [inline]
 SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
 0xffffffffffffffff

The buggy address belongs to the object at ffff8881a4820780
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 208 bytes inside of
 224-byte region [ffff8881a4820780, ffff8881a4820860)
The buggy address belongs to the page:
page:ffffea0006920800 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000200(slab)
raw: 4000000000000200 0000000000000000 0000000000000000 00000001800c000c
raw: 0000000000000000 0000000100000001 ffff8881dab70200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881a4820700: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881a4820780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881a4820800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                                 ^
 ffff8881a4820880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8881a4820900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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