Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 78987)
+++ Modules/posixmodule.c	(working copy)
@@ -2952,6 +2952,11 @@
                 PyMem_Free(path);
 		return NULL;
 	}
+	if (argc < 1) {
+		PyErr_SetString(PyExc_ValueError, "execv() arg 2 must not be empty");
+                PyMem_Free(path);
+		return NULL;
+	}
 
 	argvlist = PyMem_NEW(char *, argc+1);
 	if (argvlist == NULL) {