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ccb2390d4f
Fixes: 45a8e962a5 ("kernel: fix crash with multicast-to-unicast and fraglist GRO")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
43 lines
1.2 KiB
Diff
43 lines
1.2 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Sun, 5 May 2024 20:36:56 +0200
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Subject: [PATCH] net: bridge: fix corrupted ethernet header on
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multicast-to-unicast
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The change from skb_copy to pskb_copy unfortunately changed the data
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copying to omit the ethernet header, since it was pulled before reaching
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this point. Fix this by calling __skb_push/pull around pskb_copy.
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Fixes: 59c878cbcdd8 ("net: bridge: fix multicast-to-unicast with fraglist GSO")
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/bridge/br_forward.c
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+++ b/net/bridge/br_forward.c
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@@ -258,6 +258,7 @@ static void maybe_deliver_addr(struct ne
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{
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struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
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const unsigned char *src = eth_hdr(skb)->h_source;
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+ struct sk_buff *nskb;
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if (!should_deliver(p, skb))
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return;
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@@ -266,12 +267,16 @@ static void maybe_deliver_addr(struct ne
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if (skb->dev == p->dev && ether_addr_equal(src, addr))
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return;
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- skb = pskb_copy(skb, GFP_ATOMIC);
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- if (!skb) {
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+ __skb_push(skb, ETH_HLEN);
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+ nskb = pskb_copy(skb, GFP_ATOMIC);
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+ __skb_pull(skb, ETH_HLEN);
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+ if (!nskb) {
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DEV_STATS_INC(dev, tx_dropped);
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return;
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}
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+ skb = nskb;
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+ __skb_pull(skb, ETH_HLEN);
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if (!is_broadcast_ether_addr(addr))
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memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
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