[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, 3 insertions, 11 deletions

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 3da9264449f7..3e41f9d6d51c 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -407,12 +407,8 @@ static unsigned int br_nf_pre_routing_ipv6(unsigned int hook,
         if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
                 if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
                         goto inhdr_error;
-                if (pkt_len + sizeof(struct ipv6hdr) < skb->len) {
-                        if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr)))
-                                goto inhdr_error;
-                        if (skb->ip_summed == CHECKSUM_HW)
-                                skb->ip_summed = CHECKSUM_NONE;
-                }
+                if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
+                        goto inhdr_error;
         }
         if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb))
                 goto inhdr_error;
@@ -495,11 +491,7 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
         if (skb->len < len || len < 4 * iph->ihl)
                 goto inhdr_error;
 
-        if (skb->len > len) {
-                __pskb_trim(skb, len);
-                if (skb->ip_summed == CHECKSUM_HW)
-                        skb->ip_summed = CHECKSUM_NONE;
-        }
+        pskb_trim_rcsum(skb, len);
 
         nf_bridge_put(skb->nf_bridge);
         if (!nf_bridge_alloc(skb))