res_rtp_multicast: Fix SEGV in ast_multicast_rtp_create_options

ast_multicast_rtp_create_options now checks for NULL or empty options

Change-Id: Ib845eae46a67a9787e89a87ebd1027344e5e0362

diff --git a/res/res_rtp_multicast.c b/res/res_rtp_multicast.c
index 53bdf14a4cdaea6b1e50b8bed942b39b90ff36da..ea313476e6443f105cbaa615c20c2ccff26d1b91 100644 (file)
--- a/res/res_rtp_multicast.c
+++ b/res/res_rtp_multicast.c
@@ -143,7 +143,7 @@ struct ast_multicast_rtp_options *ast_multicast_rtp_create_options(const char *t
 
        mcast_options = ast_calloc(1, sizeof(*mcast_options)
                        + strlen(type)
-                       + strlen(options) + 2);
+                       + strlen(S_OR(options, "")) + 2);
        if (!mcast_options) {
                return NULL;
        }
@@ -155,8 +155,9 @@ struct ast_multicast_rtp_options *ast_multicast_rtp_create_options(const char *t
        mcast_options->type = pos;
        pos += strlen(type) + 1;
 
-       /* Safe */
-       strcpy(pos, options);
+       if (!ast_strlen_zero(options)) {
+               strcpy(pos, options); /* Safe */
+       }
        mcast_options->options = pos;
 
        if (ast_app_parse_options(multicast_rtp_options, &mcast_options->opts,