From 93ff8725b3f678586fbbc19d3d4b615b218300ff Mon Sep 17 00:00:00 2001
From: Steve Dower <steve.dower@microsoft.com>
Date: Sat, 19 Nov 2016 19:03:54 -0800
Subject: [PATCH] Issue #28732: Raise ValueError when argv[0] is empty.

---
 Modules/posixmodule.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 6170ff7f79b..3e446a524e9 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -5210,6 +5210,15 @@ os_spawnv_impl(PyObject *module, int mode, PyObject *path, PyObject *argv)
                 "spawnv() arg 2 must contain only strings");
             return NULL;
         }
+#ifdef MS_WINDOWS
+        if (i == 0 && !argvlist[0][0]) {
+            free_string_array(argvlist, i);
+            PyErr_SetString(
+                PyExc_ValueError,
+                "spawnv() arg 2 first element cannot be empty");
+            return NULL;
+        }
+#endif
     }
     argvlist[argc] = NULL;