From: Tian Gao <gaogaotiantian@hotmail.com>
Date: Mon, 15 Jul 2024 23:11:02 +0000 (-0700)
Subject: gh-121814: Only check f_trace_opcodes if Python frame exists (#121818)
X-Git-Tag: v3.14.0a1~1118
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2b1b68939b15b913080a3403e3ba18e2a1f520ef;p=thirdparty%2FPython%2Fcpython.git

gh-121814: Only check f_trace_opcodes if Python frame exists (#121818)

Co-authored-by: Matt Wozniski <godlygeek@gmail.com>
---

diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-07-15-20-41-06.gh-issue-121814.oR2ixR.rst b/Misc/NEWS.d/next/Core and Builtins/2024-07-15-20-41-06.gh-issue-121814.oR2ixR.rst
new file mode 100644
index 000000000000..14666de45f32
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-07-15-20-41-06.gh-issue-121814.oR2ixR.rst	
@@ -0,0 +1 @@
+Fixed the SegFault when :c:func:`PyEval_SetTrace` is used with no Python frame on stack.
diff --git a/Python/legacy_tracing.c b/Python/legacy_tracing.c
index 74118030925e..1103d999dfae 100644
--- a/Python/legacy_tracing.c
+++ b/Python/legacy_tracing.c
@@ -605,7 +605,7 @@ _PyEval_SetTrace(PyThreadState *tstate, Py_tracefunc func, PyObject *arg)
             (1 << PY_MONITORING_EVENT_STOP_ITERATION);
 
         PyFrameObject* frame = PyEval_GetFrame();
-        if (frame->f_trace_opcodes) {
+        if (frame && frame->f_trace_opcodes) {
             int ret = _PyEval_SetOpcodeTrace(frame, true);
             if (ret != 0) {
                 return ret;