diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-06-10 20:20:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-14 16:56:22 +0200 |
| commit | cf28cb51f01b4b7b713ca416661576448f8eee7e (patch) | |
| tree | 59391f64c2af81b86f2b62f05d874616c404caaa /net/netfilter | |
| parent | 8f6714f3c12b827c2e46f17999c9535bad1a6f07 (diff) | |
netfilter: nft_exthdr: check for IPv6 packet before further processing
[ Upstream commit cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.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 3c48cdc8935d..faa0844c01fb 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); |