[UDP]: Avoid repeated counting of checksum errors due to peeking

Currently it is possible for two processes to peek on the same socket
and end up incrementing the error counter twice for the same packet.

This patch fixes it by making skb_kill_datagram return whether it
succeeded in unlinking the packet and only incrementing the counter
if it did.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d39f53ef66bb..17b3f70fbbc3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1549,7 +1549,7 @@ extern int	       skb_copy_and_csum_datagram_iovec(struct sk_buff *skb,
                                                         int hlen,
                                                         struct iovec *iov);
 extern void            skb_free_datagram(struct sock *sk, struct sk_buff *skb);
-extern void            skb_kill_datagram(struct sock *sk, struct sk_buff *skb,
+extern int             skb_kill_datagram(struct sock *sk, struct sk_buff *skb,
                                          unsigned int flags);
 extern __wsum          skb_checksum(const struct sk_buff *skb, int offset,
                                     int len, __wsum csum);