[Python-checkins] Fix possible NULL pointer dereference in _PyThread_CurrentFrames (GH-96584)

[miss-islington]

https://github.com/python/cpython/commit/c563b892618d1859ce0191c2e8097df4b3469f9a
commit: c563b892618d1859ce0191c2e8097df4b3469f9a
branch: 3.11
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2022-09-10T04:12:46-07:00
summary:

Fix possible NULL pointer dereference in _PyThread_CurrentFrames (GH-96584)

(cherry picked from commit 88a7f661ca02c0eb76b8f19234b8293b70f171e2)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303 at users.noreply.github.com>

files:
A Misc/NEWS.d/next/Core and Builtins/2022-09-05-15-07-25.gh-issue-96582.HEsL5s.rst
M Python/pystate.c

diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-09-05-15-07-25.gh-issue-96582.HEsL5s.rst b/Misc/NEWS.d/next/Core and Builtins/2022-09-05-15-07-25.gh-issue-96582.HEsL5s.rst
new file mode 100644
index 00000000000..162f7baadf4
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-09-05-15-07-25.gh-issue-96582.HEsL5s.rst	
@@ -0,0 +1 @@
+Fix possible ``NULL`` pointer dereference in ``_PyThread_CurrentFrames``. Patch by Kumar Aditya.
diff --git a/Python/pystate.c b/Python/pystate.c
index 3a8140badfb..12ebbe33cb8 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -1398,7 +1398,12 @@ _PyThread_CurrentFrames(void)
             if (id == NULL) {
                 goto fail;
             }
-            int stat = PyDict_SetItem(result, id, (PyObject *)_PyFrame_GetFrameObject(frame));
+            PyObject *frameobj = (PyObject *)_PyFrame_GetFrameObject(frame);
+            if (frameobj == NULL) {
+                Py_DECREF(id);
+                goto fail;
+            }
+            int stat = PyDict_SetItem(result, id, frameobj);
             Py_DECREF(id);
             if (stat < 0) {
                 goto fail;