[3/3] [NET]: skb_trim audit

[Herbert Xu]

Hi:

[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 <[EMAIL PROTECTED]>

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

diff --git a/include/net/sock.h b/include/net/sock.h
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -873,10 +873,7 @@ static inline int sk_filter(struct sock 
                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)
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -407,12 +407,8 @@ static unsigned int br_nf_pre_routing_ip
        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(un
        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))
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c 
b/net/ipv6/netfilter/nf_conntrack_reasm.c
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -456,13 +456,9 @@ static int nf_ct_frag6_queue(struct nf_c
                DEBUGP("queue: message is too short.\n");
                goto err;
        }
-       if (end-offset < skb->len) {
-               if (pskb_trim(skb, end - offset)) {
-                       DEBUGP("Can't trim\n");
-                       goto err;
-               }
-               if (skb->ip_summed != CHECKSUM_UNNECESSARY)
-                       skb->ip_summed = CHECKSUM_NONE;
+       if (pskb_trim_rcsum(skb, end - offset)) {
+               DEBUGP("Can't trim\n");
+               goto err;
        }
 
        /* Find out which fragments are in front and at the back of us