- Issue #1039, #8154: Fix os.execlp() crash with missing 2nd argument.

Lib/test/test_os.py

@@ -505,6 +505,9 @@ class URandomTests (unittest.TestCase):
         except NotImplementedError:
             pass
 
+    def test_execvpe_with_bad_arglist(self):
+        self.assertRaises(ValueError, os.execvpe, 'notepad', [], None)
+
 class Win32ErrorTests(unittest.TestCase):
     def test_rename(self):
         self.assertRaises(WindowsError, os.rename, test_support.TESTFN, test_support.TESTFN+".bak")

Misc/NEWS

@@ -63,6 +63,8 @@ Library
 Extension Modules
 -----------------
 
+- Issue #1039, #8154: Fix os.execlp() crash with missing 2nd argument.
+
 - Issue #6949: Allow the _bsddb extension to be built with db-4.8.x.
 
 - Issue #8142: Update libffi to the 3.0.9 release.

Modules/posixmodule.c

@@ -2952,6 +2952,11 @@ posix_execv(PyObject *self, PyObject *args)
                 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) {