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

diff --git a/target/linux/generic-2.6/files/drivers/net/phy/mvswitch.c b/target/linux/generic-2.6/files/drivers/net/phy/mvswitch.c
index be9e6af..8eae439 100644 (file)
--- a/target/linux/generic-2.6/files/drivers/net/phy/mvswitch.c
+++ b/target/linux/generic-2.6/files/drivers/net/phy/mvswitch.c
@@ -78,7 +78,7 @@ mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
        if (__vlan_hwaccel_get_tag(skb, &vid))
                goto error;
 
-       if ((skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
+       if (skb_cloned(skb) || (skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
                if (pskb_expand_head(skb, MV_HEADER_SIZE, 0, GFP_ATOMIC))
                        goto error_expand;
                if (skb->len < 62)