diff options
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r-- | net/core/skbuff.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 9dc9e231bd64..59976c5a7e3b 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4954,13 +4954,18 @@ EXPORT_SYMBOL_GPL(skb_gso_validate_mtu); static struct sk_buff *skb_reorder_vlan_header(struct sk_buff *skb) { + int mac_len; + if (skb_cow(skb, skb_headroom(skb)) < 0) { kfree_skb(skb); return NULL; } - memmove(skb->data - ETH_HLEN, skb->data - skb->mac_len - VLAN_HLEN, - 2 * ETH_ALEN); + mac_len = skb->data - skb_mac_header(skb); + if (likely(mac_len > VLAN_HLEN + ETH_TLEN)) { + memmove(skb_mac_header(skb) + VLAN_HLEN, skb_mac_header(skb), + mac_len - VLAN_HLEN - ETH_TLEN); + } skb->mac_header += VLAN_HLEN; return skb; } |