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netfilter: nft_exthdr: call ipv6_find_hdr() with explicitly initialized offset 

In nft's nft_exthdr_eval() routine we process IPv6 extension header
through invoking ipv6_find_hdr(), but we call it with an uninitialized
offset variable that contains some stack value. In ipv6_find_hdr()
we then test if the value of offset != 0 and call skb_header_pointer()
on that offset in order to map struct ipv6hdr into it. Fix it up by
initializing offset to 0 as it was probably intended to be.

Fixes: 96518518cc ("netfilter: add nftables")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Daniel Borkmann 2013-12-20 11:23:15 +01:00 committed by Pablo Neira Ayuso
parent 45c2aff645
commit 540436c80e
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nft_exthdr.c
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@ -31,7 +31,7 @@ static void nft_exthdr_eval(const struct nft_expr *expr,
{
struct nft_exthdr *priv = nft_expr_priv(expr);
struct nft_data *dest = &data[priv->dreg];
unsigned int offset;
unsigned int offset = 0;
int err;
err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL);