netdev - [PATCH net] net: dsa: skb_put_padto() already frees nskb

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Date:   Mon, 21 Aug 2017 12:41:43 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, woojung.huh@...rochip.com,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net] net: dsa: skb_put_padto() already frees nskb

skb_put_padto() already frees the passed sk_buff reference upon error,
so calling kfree_skb() on it again is not necessary.

Detected by CoverityScan, CID#1416687 ("USE_AFTER_FREE")

Fixes: e71cb9e00922 ("net: dsa: ksz: fix skb freeing")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 net/dsa/tag_ksz.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index de66ca8e6201..107172c82107 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -60,10 +60,8 @@ static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
 					 skb_transport_header(skb) - skb->head);
 		skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
 
-		if (skb_put_padto(nskb, nskb->len + padlen)) {
-			kfree_skb(nskb);
+		if (skb_put_padto(nskb, nskb->len + padlen))
 			return NULL;
-		}
 
 		kfree_skb(skb);
 	}
-- 
2.9.3