diff -Brau a/util/odbcinstw.c b/util/odbcinstw.c
--- a/util/odbcinstw.c	2014-04-23 21:54:40.000000000 +0200
+++ b/util/odbcinstw.c	2015-05-08 15:03:59.981912566 +0200
@@ -74,7 +74,8 @@
       SQLGetPrivateProfileString. So, taking precautions against unititialized
       values in the allocated buffer.
     */
-    memset(ret, 0, cbRetBuffer + 1);
+	if (ret)
+      memset(ret, 0, cbRetBuffer + 1);
   }
   else
     ret= NULL;
@@ -105,7 +106,8 @@
   x_free(section);
   x_free(entry);
   x_free(def);
-  x_free(ret);
+  if (ret)
+    free(ret);
   x_free(filename);
 
   return rc;