commit 6ae75d9d1221459ab18c2599e42fcc45f9f65617
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Thu Mar 01 02:28:41 2018 -0800
committer Xiang Zhang <angwerzx@126.com> Thu Mar 01 18:28:41 2018 +0800
tree 82f2b58db8233175751b2590e2034887946048b4
parent 82734a6769a9b986478b130d321f8bbd18e1546a

bpo-32903: Fix a memory leak in os.chdir() on Windows (GH-5801) (#5945)

(cherry picked from commit 3e197c7a6740d564ad52fb7901c07d5ff49460f5)

Co-authored-by: Alexey Izbyshev <izbyshev@users.noreply.github.com>

Modules/posixmodule.c

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 130e8c1..f6144a1 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1529,15 +1529,15 @@
             return FALSE;
         }
     }
-    if (wcsncmp(new_path, L"\\\\", 2) == 0 ||
-        wcsncmp(new_path, L"//", 2) == 0)
-        /* UNC path, nothing to do. */
-        return TRUE;
-    env[1] = new_path[0];
-    result = SetEnvironmentVariableW(env, new_path);
+    int is_unc_like_path = (wcsncmp(new_path, L"\\\\", 2) == 0 ||
+                            wcsncmp(new_path, L"//", 2) == 0);
+    if (!is_unc_like_path) {
+        env[1] = new_path[0];
+        result = SetEnvironmentVariableW(env, new_path);
+    }
     if (new_path != path_buf)
         PyMem_RawFree(new_path);
-    return result;
+    return result ? TRUE : FALSE;
 }
 #endif