Index: subversion/libsvn_subr/path.c
===================================================================
--- subversion/libsvn_subr/path.c	(revision 6653)
+++ subversion/libsvn_subr/path.c	(working copy)
@@ -810,6 +810,10 @@
   /* Skip to the first slash that's after the schema. */
   path = strchr (path, '/');
 
+  /* Nothing to validate if there's no slash. */
+  if (! path)
+    return TRUE;
+
   for (i = 0; path[i]; i++)
     {
       /* Allow '%XX' (where each X is a hex digit) */