[NET]: skb_trim audit

I found a few more spots where pskb_trim_rcsum could be used but were not.
This patch changes them to use it.

Also, sk_filter can get paged skb data.  Therefore we must use pskb_trim
instead of skb_trim.

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

1 files changed, 1 insertions, 4 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 75b0e97ed93d..96565ff0de6a 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -873,10 +873,7 @@ static inline int sk_filter(struct sock *sk, struct sk_buff *skb, int needlock)
                 if (filter) {
                         unsigned int pkt_len = sk_run_filter(skb, filter->insns,
                                                              filter->len);
-                        if (!pkt_len)
-                                err = -EPERM;
-                        else
-                                skb_trim(skb, pkt_len);
+                        err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM;
                 }
 
                 if (needlock)