Fixed Segv in nacm write when MERGE and creating object

CHANGELOG.md

@@ -49,6 +49,8 @@
 * pseudo-plugin added, to enable callbacks also for main programs. Useful for extensions
 
 ### Corrected Bugs
+* Fixed Segv in nacm write when MERGE and creating object
+  * Should only be applicable on netconf MERGE and restconf PATCH
 * Corrected problem with namespace context cache, was not always cleared when adding new subtrees.
 * Corrected CLI bug with lists of multiple keys (netconf/restconf works).
   * Worked in 3.10, but broke in 4.0

lib/src/clixon_datastore_write.c

@@ -492,7 +492,7 @@ text_modify(clicon_handle       h,
 	    }
 	    if (x0==NULL){
 		if (op==OP_MERGE && !permit && xnacm){
-		    if ((ret = nacm_datanode_write(NULL, x0, x0?NACM_UPDATE:NACM_CREATE, username, xnacm, cbret)) < 0) 
+		    if ((ret = nacm_datanode_write(NULL, x1, NACM_CREATE, username, xnacm, cbret)) < 0) 
 			goto done;
 		    if (ret == 0)
 			goto fail;

lib/src/clixon_nacm.c

@@ -342,7 +342,7 @@ nacm_rule_datanode(cxobj           *xt,
     if ((module_rule = xml_find_body(xrule, "module-name")) == NULL)
 	goto nomatch;
     if (strcmp(module_rule,"*")!=0){
-	if ((ys = xml_spec(xr)) == NULL)
+	if (xr==NULL || (ys = xml_spec(xr)) == NULL)
 	    goto nomatch;
 	ymod = ys_module(ys);
 	module = yang_argument_get(ymod);