Commit 23e9fcfe authored by Alexey Kodanev's avatar Alexey Kodanev Committed by Steffen Klassert

vti: fix NULL dereference in xfrm_input()

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: default avatarAlexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 67a63387
...@@ -429,6 +429,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) ...@@ -429,6 +429,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
nf_reset(skb); nf_reset(skb);
if (decaps) { if (decaps) {
if (skb->sp)
skb->sp->olen = 0; skb->sp->olen = 0;
skb_dst_drop(skb); skb_dst_drop(skb);
gro_cells_receive(&gro_cells, skb); gro_cells_receive(&gro_cells, skb);
...@@ -440,6 +441,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) ...@@ -440,6 +441,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async); err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
if (xfrm_gro) { if (xfrm_gro) {
if (skb->sp)
skb->sp->olen = 0; skb->sp->olen = 0;
skb_dst_drop(skb); skb_dst_drop(skb);
gro_cells_receive(&gro_cells, skb); gro_cells_receive(&gro_cells, skb);
......
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