diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-06-10 20:20:30 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-06-16 20:51:50 +0200 |
| commit | cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4 (patch) | |
| tree | 54f088ff4225a9734981d24578bc2c67d266e10b /net/netfilter | |
| parent | 8744365e258459775bd9b49b705a82d66a21c2b4 (diff) | |
| download | linux-cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4.tar.gz linux-cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4.tar.bz2 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/netfilter')
| -rw-r--r-- | net/netfilter/nft_exthdr.c | 3 |
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); |