diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-06-10 21:20:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-14 17:53:29 +0300 |
| commit | 4759c55ff1d52074bde823cb9931377ee1f6051a (patch) | |
| tree | 06b78c1b2d300ba5df31c9fc2958ec80cf32b808 /net | |
| parent | e4db789e937e751507d34421176fc7156ffdfdc8 (diff) | |
| download | linux-4759c55ff1d52074bde823cb9931377ee1f6051a.tar.xz | |
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 427d77b111b1..00f4323cfeb8 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); |