handle NULL pointers gracefully

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@222 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_cgi.c b/program/src/rrd_cgi.c
index 4543044c2ad445938dad2a9c536d0bf9ab17f1d4..7f248ab04f1feac44885bd971bce88bb7d89e889 100644 (file)
--- a/program/src/rrd_cgi.c
+++ b/program/src/rrd_cgi.c
@@ -83,7 +83,11 @@ static void calfree (void){
 
 /* create freeable version of the string */
 char * stralloc(char *str){
-  char *nstr = malloc((strlen(str)+1)*sizeof(char));
+  char *nstr;
+  if (str == NULL) {  
+        return NULL;
+  }
+  nstr = malloc((strlen(str)+1)*sizeof(char));
   strcpy(nstr,str);
   return(nstr);
 }