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net: bridge: fix corrupted ethernet header on multicast-to-unicast 

The change from skb_copy to pskb_copy unfortunately changed the data
copying to omit the ethernet header, since it was pulled before reaching
this point. Fix this by calling __skb_push/pull around pskb_copy.

Fixes: 59c878cbcd ("net: bridge: fix multicast-to-unicast with fraglist GSO")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Felix Fietkau 2024-05-05 20:42:38 +02:00 committed by David S. Miller
parent 6963c508fd
commit 86b29d830a
1 changed files with 7 additions and 2 deletions
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9
net/bridge/br_forward.c
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@ -258,6 +258,7 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
{
struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
const unsigned char *src = eth_hdr(skb)->h_source;
struct sk_buff *nskb;
if (!should_deliver(p, skb))
return;
@ -266,12 +267,16 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
if (skb->dev == p->dev && ether_addr_equal(src, addr))
return;
skb = pskb_copy(skb, GFP_ATOMIC);
if (!skb) {
__skb_push(skb, ETH_HLEN);
nskb = pskb_copy(skb, GFP_ATOMIC);
__skb_pull(skb, ETH_HLEN);
if (!nskb) {
DEV_STATS_INC(dev, tx_dropped);
return;
}
skb = nskb;
__skb_pull(skb, ETH_HLEN);
if (!is_broadcast_ether_addr(addr))
memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);