1 files changed, 8 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 750b06afd20..cf73cc70ed2 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -84,6 +84,14 @@ static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
         *dataoff = nhoff + (iph->ihl << 2);
         *protonum = iph->protocol;
 
+        /* Check bogus IP headers */
+        if (*dataoff > skb->len) {
+                pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: "
+                         "nhoff %u, ihl %u, skblen %u\n",
+                         nhoff, iph->ihl << 2, skb->len);
+                return -NF_ACCEPT;
+        }
+
         return NF_ACCEPT;
 }