https://github.com/python/cpython/commit/6763bfcc0fbab7895514c1f954d79a2555036323
commit: 6763bfcc0fbab7895514c1f954d79a2555036323
branch: main
author: Irit Katriel <[email protected]>
committer: iritkatriel <[email protected]>
date: 2024-05-01T21:51:40+01:00
summary:
gh-118272: set stacktop to 0 before freeing contents, to avoid access to
invalid objects during GC (#118478)
files:
M Python/frame.c
diff --git a/Python/frame.c b/Python/frame.c
index ec390e7426ad47..2bb12823572028 100644
--- a/Python/frame.c
+++ b/Python/frame.c
@@ -98,10 +98,11 @@ void
_PyFrame_ClearLocals(_PyInterpreterFrame *frame)
{
assert(frame->stacktop >= 0);
- for (int i = 0; i < frame->stacktop; i++) {
+ int stacktop = frame->stacktop;
+ frame->stacktop = 0;
+ for (int i = 0; i < stacktop; i++) {
Py_XDECREF(frame->localsplus[i]);
}
- frame->stacktop = 0;
Py_CLEAR(frame->f_locals);
}
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