net: dsa: add error handling for pskb_trim_rcsum

When pskb_trim_rcsum fails, the lack of error-handling code may cause unexpected results. This patch adds error-handling code after calling pskb_trim_rcsum. Signed-off-by: Zhouyang Jia <[email protected]> Signed-off-by: David S. Miller <[email protected]>
mrcsosa · Jun 11, 2018 · 349b71d · 349b71d
1 parent 0975764
commit 349b71d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
@@ -75,7 +75,8 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 	if (!skb->dev)
 		return NULL;
 
-	pskb_trim_rcsum(skb, skb->len - 4);
+	if (pskb_trim_rcsum(skb, skb->len - 4))
+		return NULL;
 
 	return skb;
 }