commit 4c49da0cb7434c676d70b9ccf38aca82ac0d64a9 (upstream/master, master)
Author: Zackery Spytz <zspytz@gmail.com>
Date:   Fri Dec 7 03:11:30 2018 -0700

    [bpo-35436](https://bugs.python.org/issue35436): Add missing PyErr_NoMemory() calls and other minor bug fixes. (GH-11015)
    
    Set MemoryError when appropriate, add missing failure checks,
    and fix some potential leaks.

diff --git a/PC/launcher.c b/PC/launcher.c
index 0242f26391..4c620dab7c 100644
--- a/PC/launcher.c
+++ b/PC/launcher.c
@@ -1763,6 +1763,9 @@ process(int argc, wchar_t ** argv)
         }
         cch += (DWORD)wcslen(PYTHON_EXECUTABLE) + 1 + 1; /* include sep and null */
         executable = (wchar_t *)malloc(cch * sizeof(wchar_t));
+        if (executable == NULL) {
+            error(RC_NO_MEMORY, L"A memory allocation failed");
+        }
         cch_actual = MultiByteToWideChar(CP_UTF8, 0, start, len, executable, cch);
         if (!cch_actual) {
             error(RC_BAD_VENV_CFG, L"Cannot decode home path in '%ls'",