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-rw-r--r--net/core/skbuff.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index b5c75d4fcf37..1bca1e0fc8f7 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5047,8 +5047,10 @@ static struct sk_buff *skb_reorder_vlan_header(struct sk_buff *skb)
}
mac_len = skb->data - skb_mac_header(skb);
- memmove(skb_mac_header(skb) + VLAN_HLEN, skb_mac_header(skb),
- mac_len - VLAN_HLEN - ETH_TLEN);
+ 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;
}