From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Subject: [PATCH nf 1/2] netfilter: nft_exthdr: check for IPv6 packet before further processing
Date: Thu, 10 Jun 2021 20:20:30 +0200 [thread overview]
Message-ID: <20210610182032.28096-1-pablo@netfilter.org> (raw)
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>
---
net/netfilter/nft_exthdr.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c
index 7f705b5c09de..d8f03175879f 100644
--- a/net/netfilter/nft_exthdr.c
+++ b/net/netfilter/nft_exthdr.c
@@ -44,6 +44,9 @@ static void nft_exthdr_ipv6_eval(const struct nft_expr *expr,
unsigned int offset = 0;
int err;
+ if (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);
--
2.20.1
next reply other threads:[~2021-06-10 18:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 18:20 Pablo Neira Ayuso [this message]
2021-06-10 18:20 ` [PATCH nf 2/2] netfilter: nft_osf: check for TCP packet before further processing Pablo Neira Ayuso
2021-06-16 14:42 ` kernel test robot
2021-06-16 12:48 ` [PATCH nf 1/2] netfilter: nft_exthdr: check for IPv6 " kernel test robot
2021-06-16 13:48 ` kernel test robot
2021-06-16 14:14 ` kernel test robot
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