1 files changed, 25 insertions, 1 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 174d4d35e951..b41dcbb89685 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2530,8 +2530,32 @@ static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, int o
 
         /* Set the values to the specific association */
         if (asoc) {
-                if (assocparams.sasoc_asocmaxrxt != 0)
+                if (assocparams.sasoc_asocmaxrxt != 0) {
+                        __u32 path_sum = 0;
+                        int   paths = 0;
+                        struct list_head *pos;
+                        struct sctp_transport *peer_addr;
+
+                        list_for_each(pos, &asoc->peer.transport_addr_list) {
+                                peer_addr = list_entry(pos,
+                                                struct sctp_transport,
+                                                transports);
+                                path_sum += peer_addr->pathmaxrxt;
+                                paths++;
+                        }
+
+                        /* Only validate asocmaxrxt if we have more then
+                         * one path/transport.  We do this because path
+                         * retransmissions are only counted when we have more
+                         * then one path.
+                         */
+                        if (paths > 1 &&
+                            assocparams.sasoc_asocmaxrxt > path_sum)
+                                return -EINVAL;
+
                         asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
+                }
+
                 if (assocparams.sasoc_cookie_life != 0) {
                         asoc->cookie_life.tv_sec =
                                         assocparams.sasoc_cookie_life / 1000;