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-rw-r--r--Misc/NEWS.d/next/Core and Builtins/2022-08-22-21-33-28.gh-issue-96187.W_6SRG.rst2
-rw-r--r--Objects/codeobject.c2
2 files changed, 3 insertions, 1 deletions
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-08-22-21-33-28.gh-issue-96187.W_6SRG.rst b/Misc/NEWS.d/next/Core and Builtins/2022-08-22-21-33-28.gh-issue-96187.W_6SRG.rst
new file mode 100644
index 0000000..fd194fa
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-08-22-21-33-28.gh-issue-96187.W_6SRG.rst
@@ -0,0 +1,2 @@
+Fixed a bug that caused ``_PyCode_GetExtra`` to return garbage for negative
+indexes. Patch by Pablo Galindo
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index aeb6a8c..72712f4 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -1339,7 +1339,7 @@ _PyCode_GetExtra(PyObject *code, Py_ssize_t index, void **extra)
PyCodeObject *o = (PyCodeObject*) code;
_PyCodeObjectExtra *co_extra = (_PyCodeObjectExtra*) o->co_extra;
- if (co_extra == NULL || co_extra->ce_size <= index) {
+ if (co_extra == NULL || index < 0 || co_extra->ce_size <= index) {
*extra = NULL;
return 0;
}