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netfilter: nft_exthdr: check for IPv6 packet before further processing 

ipv6_find_hdr() does not validate that this is an IPv6 packet. Add a
sanity check for calling ipv6_find_hdr() to make sure an IPv6 packet
is passed for parsing.

Fixes: 96518518cc ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2021-06-10 20:20:30 +02:00
parent 8744365e25
commit cdd73cc545
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nft_exthdr.c
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@ -42,6 +42,9 @@ static void nft_exthdr_ipv6_eval(const struct nft_expr *expr,
unsigned int offset = 0; unsigned int offset = 0;
int err; int err;
if (pkt->skb->protocol != htons(ETH_P_IPV6))
goto err;
err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL); err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL);
if (priv->flags & NFT_EXTHDR_F_PRESENT) { if (priv->flags & NFT_EXTHDR_F_PRESENT) {
nft_reg_store8(dest, err >= 0); nft_reg_store8(dest, err >= 0);