From f8a0a781488ec7288d1049e5d2022850aa98f7b6 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 18 Dec 2010 19:30:50 +0100 Subject: [PATCH] mac80211: fix potentially redundant skb data copying When an skb is shared, it needs to be duplicated, along with its data buffer. If the skb does not have enough headroom, using skb_copy might cause the data buffer to be copied twice (once by skb_copy and once by pskb_expand_head). Fix this by using skb_clone initially and letting ieee80211_skb_resize sort out the rest. Signed-off-by: Felix Fietkau Signed-off-by: John W. Linville --- net/mac80211/tx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 90ee23550033..d2b4b67a7b53 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1934,7 +1934,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, */ if (skb_shared(skb)) { tmp_skb = skb; - skb = skb_copy(skb, GFP_ATOMIC); + skb = skb_clone(skb, GFP_ATOMIC); kfree_skb(tmp_skb); if (!skb) { -- 2.20.1