Patch "netfilter: nft_payload: fix wrong mac header matching" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    netfilter: nft_payload: fix wrong mac header matching

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-nft_payload-fix-wrong-mac-header-matching.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@xxxxxxxxx>
Date: Sun, 8 Oct 2023 19:36:53 +0200
Subject: netfilter: nft_payload: fix wrong mac header matching
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Florian Westphal <fw@xxxxxxxxx>

commit d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6 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: 96518518cc41 ("netfilter: add nftables")
Reported-by: Blažej Krajňák <krajnak@xxxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/netfilter/nft_payload.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -179,7 +179,7 @@ void nft_payload_eval(const struct nft_e
 
 	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) &&


Patches currently in stable-queue which might be from fw@xxxxxxxxx are

queue-6.5/netfilter-nft_payload-fix-wrong-mac-header-matching.patch



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