From: Kumar Aditya <kumaraditya@python.org>
Date: Sat, 23 May 2026 08:57:13 +0000 (+0530)
Subject: gh-149816: add missing critical section on self in buffered_iternext (#150295)
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=e8545ed3eafbf349b51ea308126a67dc70416a62;p=thirdparty%2FPython%2Fcpython.git

gh-149816: add missing critical section on self in buffered_iternext (#150295)
---

diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 0fdae7b2d210..5537947f6a51 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -1509,7 +1509,9 @@ buffered_iternext(PyObject *op)
         tp == state->PyBufferedRandom_Type)
     {
         /* Skip method call overhead for speed */
+        Py_BEGIN_CRITICAL_SECTION(self);
         line = _buffered_readline(self, -1);
+        Py_END_CRITICAL_SECTION();
     }
     else {
         line = PyObject_CallMethodNoArgs((PyObject *)self,