[PATCH] net: dsa: add error handling for pskb_trim_rcsum

[Zhouyang Jia]

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 <jiazhouyan...@gmail.com>
---
 net/dsa/tag_trailer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 7d20e1f..56197f0 100644
--- 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;
 }
-- 
2.7.4