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add extra safety for the packet mangling in the mvswitch driver
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11880 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -78,7 +78,7 @@ mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
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if (__vlan_hwaccel_get_tag(skb, &vid))
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goto error;
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if ((skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
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if (skb_cloned(skb) || (skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
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if (pskb_expand_head(skb, MV_HEADER_SIZE, 0, GFP_ATOMIC))
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goto error_expand;
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if (skb->len < 62)
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