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netfilter: nft_payload: fix wrong mac header matching
commitd351c1ea2d
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>
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1 changed files with 1 additions and 1 deletions
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@ -133,7 +133,7 @@ void nft_payload_eval(const struct nft_expr *expr,
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switch (priv->base) {
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case NFT_PAYLOAD_LL_HEADER:
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if (!skb_mac_header_was_set(skb))
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if (!skb_mac_header_was_set(skb) || skb_mac_header_len(skb) == 0)
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goto err;
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if (skb_vlan_tag_present(skb)) {
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