From: Victor Stinner <vstinner@python.org>
Date: Wed, 18 Mar 2026 17:20:35 +0000 (+0100)
Subject: gh-146093: Fix csv _set_str(): check if PyUnicode_DecodeASCII() failed (#146113)
X-Git-Tag: v3.15.0a8~261
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=724c7c8146f44a7c737ec4588a1ee4b9db994f6f;p=thirdparty%2FPython%2Fcpython.git

gh-146093: Fix csv _set_str(): check if PyUnicode_DecodeASCII() failed (#146113)

The function can fail on a memory allocation failure.

Bug reported by devdanzin.
---

diff --git a/Modules/_csv.c b/Modules/_csv.c
index c48f44c0f078..a3f840acbe8c 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -315,8 +315,12 @@ _set_char(const char *name, Py_UCS4 *target, PyObject *src, Py_UCS4 dflt)
 static int
 _set_str(const char *name, PyObject **target, PyObject *src, const char *dflt)
 {
-    if (src == NULL)
+    if (src == NULL) {
         *target = PyUnicode_DecodeASCII(dflt, strlen(dflt), NULL);
+        if (*target == NULL) {
+            return -1;
+        }
+    }
     else {
         if (!PyUnicode_Check(src)) {
             PyErr_Format(PyExc_TypeError,