skbuff: fix error handling in pskb_copy()

There are two problems:
1) "n" was allocated with alloc_skb() so we should free it with
   kfree_skb() instead of regular kfree().
2) We return the freed pointer instead of NULL.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d220119f13ab..2beda824636e 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -799,7 +799,8 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
 
                 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
                         if (skb_copy_ubufs(skb, gfp_mask)) {
-                                kfree(n);
+                                kfree_skb(n);
+                                n = NULL;
                                 goto out;
                         }
                         skb_shinfo(skb)->tx_flags &= ~SKBTX_DEV_ZEROCOPY;