From: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
Date: Fri, 25 Jul 2008 10:02:57 +0100
> --- a/net/dccp/ipv4.c
> +++ b/net/dccp/ipv4.c
> @@ -207,7 +207,7 @@ static void dccp_v4_err(struct sk_buff *skb, u32 info)
> int err;
> struct net *net = dev_net(skb->dev);
>
> - if (skb->len < (iph->ihl << 2) + 8) {
> + if (skb->len < (iph->ihl << 2) + __dccp_basic_hdr_len(dh)) {
> ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
> return;
> }
You can't dereference "dh" before you know there is even
space past offset "iph->ihl << 2". Yet that is what doing
an unconditional __dccp_basic_hdr_len() call here is going
to do.
The ipv6 patch has the same bug.
The test probably needs to be something like:
if (skb->len < (iph->ihl << 2) + sizeof(*dh) ||
skb->len < (iph->ihl << 2) + __dccp_basic_hdr_len(dh))
in order to make the tests safely.
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