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| author | Florian Westphal <fw@strlen.de> | 2023-10-08 19:36:53 +0200 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2023-10-12 10:28:45 +0200 |
| commit | d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6 (patch) | |
| tree | f404d1a5d8f782c0cc555ffe1e25532f4fc0bcb3 /net | |
| parent | 505ce0630ad5d31185695f8a29dde8d29f28faa7 (diff) | |
| download | linux-stable-d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6.tar.gz linux-stable-d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6.tar.bz2 linux-stable-d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6.zip | |
netfilter: nft_payload: fix wrong mac header matching
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: 96518518cc41 ("netfilter: add nftables")
Reported-by: Blažej Krajňák <krajnak@levonet.sk>
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nft_payload.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c index 120f6d395b98..0a689c8e0295 100644 --- a/net/netfilter/nft_payload.c +++ b/net/netfilter/nft_payload.c @@ -179,7 +179,7 @@ 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) && |