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[PATCH] mac80211: Ensure enough headroom when forwarding mesh pkt

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When a buffer is duplicated during MESH packet forwarding,
this patch ensures that the new buffer has enough headroom.

Signed-off-by: Cedric Izoard <cedric.izoard@xxxxxxxxxxxx>
---
 net/mac80211/rx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index d2a00f2..1ed32b4 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2468,7 +2468,11 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
 	if (!ifmsh->mshcfg.dot11MeshForwarding)
 		goto out;
 
-	fwd_skb = skb_copy(skb, GFP_ATOMIC);
+	if (skb_headroom(skb) >= local->tx_headroom)
+		fwd_skb = skb_copy(skb, GFP_ATOMIC);
+	else
+		fwd_skb = skb_copy_expand(skb, local->tx_headroom,
+					  0, GFP_ATOMIC);
 	if (!fwd_skb) {
 		net_info_ratelimited("%s: failed to clone mesh frame\n",
 				    sdata->name);
-- 
2.7.4



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