Commit 916c1689 authored by Li RongQing's avatar Li RongQing Committed by David S. Miller

8021q: fix a potential memory leak

skb_cow called in vlan_reorder_header does not free the skb when it failed,
and vlan_reorder_header returns NULL to reset original skb when it is called
in vlan_untag, lead to a memory leak.
Signed-off-by: default avatarLi RongQing <roy.qing.li@gmail.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1b0608fd
......@@ -114,8 +114,11 @@ EXPORT_SYMBOL(vlan_dev_vlan_proto);
static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
{
if (skb_cow(skb, skb_headroom(skb)) < 0)
if (skb_cow(skb, skb_headroom(skb)) < 0) {
kfree_skb(skb);
return NULL;
}
memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
skb->mac_header += VLAN_HLEN;
return skb;
......
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