path: root/net/xfrm/xfrm_input.c
diff options
authorAlexey Kodanev <alexey.kodanev@oracle.com>2016-08-10 13:54:57 +0300
committerSteffen Klassert <steffen.klassert@secunet.com>2016-08-11 13:15:57 +0200
commit1625f4529957738be7d87cf157e107b8fb9d23b9 (patch)
treee65c8b228135216df2f5b6e77c6e54a2976e3ec9 /net/xfrm/xfrm_input.c
parentxfrm: Ignore socket policies when rebuilding hash tables (diff)
net/xfrm_input: fix possible NULL deref of tunnel.ip6->parms.i_key
Running LTP 'icmp-uni-basic.sh -6 -p ipcomp -m tunnel' test over openvswitch + veth can trigger kernel panic: BUG: unable to handle kernel NULL pointer dereference at 00000000000000e0 IP: [<ffffffff8169d1d2>] xfrm_input+0x82/0x750 ... [<ffffffff816d472e>] xfrm6_rcv_spi+0x1e/0x20 [<ffffffffa082c3c2>] xfrm6_tunnel_rcv+0x42/0x50 [xfrm6_tunnel] [<ffffffffa082727e>] tunnel6_rcv+0x3e/0x8c [tunnel6] [<ffffffff8169f365>] ip6_input_finish+0xd5/0x430 [<ffffffff8169fc53>] ip6_input+0x33/0x90 [<ffffffff8169f1d5>] ip6_rcv_finish+0xa5/0xb0 ... It seems that tunnel.ip6 can have garbage values and also dereferenced without a proper check, only tunnel.ip4 is being verified. Fix it by adding one more if block for AF_INET6 and initialize tunnel.ip6 with NULL inside xfrm6_rcv_spi() (which is similar to xfrm4_rcv_spi()). Fixes: 049f8e2 ("xfrm: Override skb->mark with tunnel->parm.i_key in xfrm_input") Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_input.c')
1 files changed, 7 insertions, 7 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 1c4ad477ce93..6e3f0254d8a1 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -207,15 +207,15 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
family = XFRM_SPI_SKB_CB(skb)->family;
/* if tunnel is present override skb->mark value with tunnel i_key */
- if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) {
- switch (family) {
- case AF_INET:
+ switch (family) {
+ case AF_INET:
+ if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
- break;
- case AF_INET6:
+ break;
+ case AF_INET6:
+ if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
- break;
- }
+ break;
/* Allocate new secpath or COW existing one. */