Can be reproduced with LTP tests:
  # icmp-uni-vti.sh -p ah -a sha256 -m tunnel -S fffffffe -k 1 -s 10

IPv4:
  RIP: 0010:xfrm_input+0x7f9/0x870
  ...
  Call Trace:
  <IRQ>
  vti_input+0xaa/0x110 [ip_vti]
  ? skb_free_head+0x21/0x40
  vti_rcv+0x33/0x40 [ip_vti]
  xfrm4_ah_rcv+0x33/0x60
  ip_local_deliver_finish+0x94/0x1e0
  ip_local_deliver+0x6f/0xe0
  ? ip_route_input_noref+0x28/0x50
  ...

  # icmp-uni-vti.sh -6 -p ah -a sha256 -m tunnel -S fffffffe -k 1 -s 10
IPv6:
  RIP: 0010:xfrm_input+0x7f9/0x870
  ...
  Call Trace:
  <IRQ>
  xfrm6_rcv_tnl+0x3c/0x40
  vti6_rcv+0xd5/0xe0 [ip6_vti]
  xfrm6_ah_rcv+0x33/0x60
  ip6_input_finish+0xee/0x460
  ip6_input+0x3f/0xb0
  ip6_rcv_finish+0x45/0xa0
  ipv6_rcv+0x34b/0x540

xfrm_input() invokes xfrm_rcv_cb() -> vti_rcv_cb(), the last callback
might call skb_scrub_packet(), which in turn can reset secpath.

Fix it by adding a check that skb->sp is not NULL.

Fixes: 7e9e9202

 ("xfrm: Clear RX SKB secpath xfrm_offload")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>