[SCTP] Allow SCTP_MAXSEG to revert to default frag point with a '0' value.

Signed-off-by: Ivan Skytte Jorgensen <isj-sctp@i1.dk>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c66c161908c..97b556c1c45 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2306,16 +2306,14 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, int optl
                 return -EINVAL;
         if (get_user(val, (int __user *)optval))
                 return -EFAULT;
-        if ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))
+        if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
                 return -EINVAL;
         sp->user_frag = val;
 
-        if (val) {
-                /* Update the frag_point of the existing associations. */
-                list_for_each(pos, &(sp->ep->asocs)) {
-                        asoc = list_entry(pos, struct sctp_association, asocs);
-                        asoc->frag_point = sctp_frag_point(sp, asoc->pmtu); 
-                }
+        /* Update the frag_point of the existing associations. */
+        list_for_each(pos, &(sp->ep->asocs)) {
+                asoc = list_entry(pos, struct sctp_association, asocs);
+                asoc->frag_point = sctp_frag_point(sp, asoc->pmtu); 
         }
 
         return 0;