[3.13] gh-150406: Check result of PyThread_allocate_lock() for netdb_lock (GH-150407...

(cherry picked from commit 1e18c45495185cb547d43c3dd4c1cbdd8482867b)

Co-authored-by: Thomas Kowalski <thom.kowa@gmail.com>

diff --git a/Misc/NEWS.d/next/Library/2026-05-25-17-00-00.gh-issue-150406.jF3g63.rst b/Misc/NEWS.d/next/Library/2026-05-25-17-00-00.gh-issue-150406.jF3g63.rst
new file mode 100644 (file)
index 0000000..230e961
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-05-25-17-00-00.gh-issue-150406.jF3g63.rst
@@ -0,0 +1,3 @@
+Fix a possible crash occurring during :mod:`socket` module initialization
+when the system is out of memory on platforms without a reentrant
+``gethostbyname``.

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index becdf9af7181ec0c2ce8d8632aae3040fe3475f7..9cdf207e7a3380de927ce87d77926ff5548e906a 100644 (file)
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -8939,6 +8939,9 @@ socket_exec(PyObject *m)
     /* Initialize gethostbyname lock */
 #if defined(USE_GETHOSTBYNAME_LOCK)
     netdb_lock = PyThread_allocate_lock();
+    if (netdb_lock == NULL) {
+        goto error;
+    }
 #endif
 
 #ifdef MS_WINDOWS