[Python-checkins] [3.11] gh-107963: Fix set_forkserver_preload to check the type of given list (GH-107965) (gh-107976)

[corona10]

https://github.com/python/cpython/commit/db4400b5b28dc17c9eac47780402c0b812703358
commit: db4400b5b28dc17c9eac47780402c0b812703358
branch: 3.11
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: corona10 <donghee.na92 at gmail.com>
date: 2023-08-15T23:53:25+09:00
summary:

[3.11] gh-107963: Fix set_forkserver_preload to check the type of given list (GH-107965) (gh-107976)

gh-107963: Fix set_forkserver_preload to check the type of given list (GH-107965)
(cherry picked from commit 6515ec3d3d5acd3d0b99c88794bdec09f0831e5b)


gh-107963: Fix set_forkserver_preload to check the type of given list

Co-authored-by: Dong-hee Na <donghee.na at python.org>

files:
A Misc/NEWS.d/next/Library/2023-08-15-18-20-00.gh-issue-107963.20g5BG.rst
M Lib/multiprocessing/forkserver.py
M Lib/test/_test_multiprocessing.py

diff --git a/Lib/multiprocessing/forkserver.py b/Lib/multiprocessing/forkserver.py
index 22a911a7a29cd..4642707dae2f4 100644
--- a/Lib/multiprocessing/forkserver.py
+++ b/Lib/multiprocessing/forkserver.py
@@ -61,7 +61,7 @@ def _stop_unlocked(self):
 
     def set_forkserver_preload(self, modules_names):
         '''Set list of module names to try to load in forkserver process.'''
-        if not all(type(mod) is str for mod in self._preload_modules):
+        if not all(type(mod) is str for mod in modules_names):
             raise TypeError('module_names must be a list of strings')
         self._preload_modules = modules_names
 
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index aa302c21000dd..29dc386376649 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -5293,6 +5293,14 @@ def test_context(self):
             self.assertRaises(ValueError, ctx.set_start_method, None)
             self.check_context(ctx)
 
+    def test_context_check_module_types(self):
+        try:
+            ctx = multiprocessing.get_context('forkserver')
+        except ValueError:
+            raise unittest.SkipTest('forkserver should be available')
+        with self.assertRaisesRegex(TypeError, 'module_names must be a list of strings'):
+            ctx.set_forkserver_preload([1, 2, 3])
+
     def test_set_get(self):
         multiprocessing.set_forkserver_preload(PRELOAD)
         count = 0
diff --git a/Misc/NEWS.d/next/Library/2023-08-15-18-20-00.gh-issue-107963.20g5BG.rst b/Misc/NEWS.d/next/Library/2023-08-15-18-20-00.gh-issue-107963.20g5BG.rst
new file mode 100644
index 0000000000000..3a73b2da0c433
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-08-15-18-20-00.gh-issue-107963.20g5BG.rst
@@ -0,0 +1,2 @@
+Fix :func:`multiprocessing.set_forkserver_preload` to check the given list
+of modules names. Patch by Dong-hee Na.