diff -ru subprocess32-3.2.6/_posixsubprocess_helpers.c subprocess32-3.2.6_patched/_posixsubprocess_helpers.c

--- subprocess32-3.2.6/_posixsubprocess_helpers.c	2012-06-09 08:31:40.000000000 +0200

+++ subprocess32-3.2.6_patched/_posixsubprocess_helpers.c	2018-08-22 16:38:07.485734481 +0200

@@ -110,6 +110,12 @@

     if (argc == -1)

         return NULL;

+    /* Avoid 32-bit overflows to malloc() from unreasonable values. */

+    if (argc > 0x10000000) {

+        PyErr_NoMemory();

+        return NULL;

+    }

+

     array = malloc((argc + 1) * sizeof(char *));

     if (array == NULL) {

         PyErr_NoMemory();