sctp: linearize early if it's not GSO

[cascardo/linux.git] / net / sctp / input.c

diff --git a/net/sctp/input.c b/net/sctp/input.c
index c182db7..69444d3 100644 (file)
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -119,7 +119,13 @@ int sctp_rcv(struct sk_buff *skb)
                       skb_transport_offset(skb))
                goto discard_it;
 
-       if (!pskb_may_pull(skb, sizeof(struct sctphdr)))
+       /* If the packet is fragmented and we need to do crc checking,
+        * it's better to just linearize it otherwise crc computing
+        * takes longer.
+        */
+       if ((!(skb_shinfo(skb)->gso_type & SKB_GSO_SCTP) &&
+            skb_linearize(skb)) ||
+           !pskb_may_pull(skb, sizeof(struct sctphdr)))
                goto discard_it;
 
        /* Pull up the IP header. */
@@ -1177,9 +1183,6 @@ static struct sctp_association *__sctp_rcv_lookup_harder(struct net *net,
        if ((skb_shinfo(skb)->gso_type & SKB_GSO_SCTP) == SKB_GSO_SCTP)
                return NULL;
 
-       if (skb_linearize(skb))
-               return NULL;
-
        ch = (sctp_chunkhdr_t *) skb->data;
 
        /* The code below will attempt to walk the chunk and extract