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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-06-10 20:20:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 16:21:02 +0200 |
| commit | f5623bd84f6020a63d18f8d471e0d8a447d5dc43 (patch) | |
| tree | 341e339db4324fb3725e5ca7e27257f84d95ed14 /net | |
| parent | 37c723fb144c6035b733f8846af28e92588d93ab (diff) | |
| download | linux-stable-f5623bd84f6020a63d18f8d471e0d8a447d5dc43.tar.gz linux-stable-f5623bd84f6020a63d18f8d471e0d8a447d5dc43.tar.bz2 linux-stable-f5623bd84f6020a63d18f8d471e0d8a447d5dc43.zip | |
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')
| -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 47beb3abcc9d..e2c815ee06d0 100644 --- a/net/netfilter/nft_exthdr.c +++ b/net/netfilter/nft_exthdr.c @@ -34,6 +34,9 @@ static void nft_exthdr_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 (err < 0) goto err; |