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authorLi RongQing <roy.qing.li@gmail.com>2014-10-18 17:33:38 +0800
committerDavid S. Miller <davem@davemloft.net>2014-10-18 13:04:09 -0400
commita6d4518da371b0d21512ef0f641928d6f99ee70f (patch)
treed2cd98564a10f6cbf52492765d383f7959f4f001
parentfc6fb41cd64fd810bcc69fe9776d2f500778f38f (diff)
ipv6: fix a potential use after free in sit.c
pskb_may_pull() maybe change skb->data and make iph pointer oboslete, fix it by geting ip header length directly. Fixes: ca15a078 (sit: generate icmpv6 error when receiving icmpv4 error) Cc: Oussama Ghorbel <ghorbel@pivasoftware.com> Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv6/sit.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 6eab37cf5345..58e5b4710127 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -485,11 +485,11 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
*/
static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
{
- const struct iphdr *iph = (const struct iphdr *) skb->data;
+ int ihl = ((const struct iphdr *)skb->data)->ihl*4;
struct rt6_info *rt;
struct sk_buff *skb2;
- if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct ipv6hdr) + 8))
+ if (!pskb_may_pull(skb, ihl + sizeof(struct ipv6hdr) + 8))
return 1;
skb2 = skb_clone(skb, GFP_ATOMIC);
@@ -498,7 +498,7 @@ static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
return 1;
skb_dst_drop(skb2);
- skb_pull(skb2, iph->ihl * 4);
+ skb_pull(skb2, ihl);
skb_reset_network_header(skb2);
rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);