summaryrefslogtreecommitdiffstats
path: root/net
diff options
context:
space:
mode:
authorPablo Neira Ayuso <pablo@netfilter.org>2021-06-10 20:20:30 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2021-06-16 20:51:50 +0200
commitcdd73cc545c0fb9b1a1f7b209f4f536e7990cff4 (patch)
tree54f088ff4225a9734981d24578bc2c67d266e10b /net
parentMAINTAINERS: netfilter: add irc channel (diff)
downloadlinux-cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4.tar.xz
linux-cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4.zip
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: 96518518cc41 ("netfilter: add nftables") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nft_exthdr.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c
index f64f0017e9a5..670dd146fb2b 100644
--- a/net/netfilter/nft_exthdr.c
+++ b/net/netfilter/nft_exthdr.c
@@ -42,6 +42,9 @@ static void nft_exthdr_ipv6_eval(const struct nft_expr *expr,
unsigned int offset = 0;
int err;
+ if (pkt->skb->protocol != htons(ETH_P_IPV6))
+ goto err;
+
err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL);
if (priv->flags & NFT_EXTHDR_F_PRESENT) {
nft_reg_store8(dest, err >= 0);