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netfilter: nft_payload: fix wrong mac header matching

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commit d351c1ea2d upstream.

mcast packets get looped back to the local machine.
Such packets have a 0-length mac header, we should treat
this like "mac header not set" and abort rule evaluation.

As-is, we just copy data from the network header instead.

Fixes: 96518518cc ("netfilter: add nftables")
Reported-by: Blažej Krajňák <krajnak@levonet.sk>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Westphal 2023-10-08 19:36:53 +02:00 committed by Greg Kroah-Hartman
parent 79f52485a0
commit 34bc213fc4
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nft_payload.c
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@ -84,7 +84,7 @@ static void nft_payload_eval(const struct nft_expr *expr,
switch (priv->base) {
case NFT_PAYLOAD_LL_HEADER:
if (!skb_mac_header_was_set(skb))
if (!skb_mac_header_was_set(skb) || skb_mac_header_len(skb) == 0)
goto err;
if (skb_vlan_tag_present(skb)) {