From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 30 May 2026 16:56:46 +0000 (+0200)
Subject: [3.13] gh-150406: Check result of PyThread_allocate_lock() for netdb_lock (GH-150407... 
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=4d91835af5a9e7fe47609f7ec9457f6e8af39d12;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-150406: Check result of PyThread_allocate_lock() for netdb_lock (GH-150407) (GH-150618)

(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
index 000000000000..230e961abd3f
--- /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 becdf9af7181..9cdf207e7a33 100644
--- 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