Address review comments

Author: VanshAgarwal24036

Lib/test/test_traceback.py

@@ -625,18 +625,6 @@ def test_signatures(self):
             str(inspect.signature(traceback.format_exception_only)),
             '(exc, /, value=<implicit>, *, show_group=False, **kwargs)')
 
-    def test_traceback_deep_recursion_alloca(self):
-
-        def recurse(n):
-            if n == 0:
-                raise RuntimeError("boom")
-            return recurse(n - 1)
-        try:
-            recurse(50)
-        except RuntimeError as exc:
-            tb = traceback.format_exception(exc)
-            assert any("RuntimeError" in line for line in tb)
-
 
 class PurePythonExceptionFormattingMixin:
     def get_exception(self, callable, slice_start=0, slice_end=-1):

Misc/NEWS.d/next/Core_and_Builtins/2026-03-11-19-09-47.gh-issue-145792.X5KUhc.rst

@@ -1,2 +1,2 @@
-Fix incorrect memory allocation in the VLA fallback macro in traceback.c
-when using alloca(), preventing potential out-of-bounds access.
+Fix out-of-bounds access when invoking faulthandler on a CPython build
+compiled without support for VLAs.

Python/traceback.c

@@ -41,7 +41,7 @@
 
 #if defined(__STDC_NO_VLA__) && (__STDC_NO_VLA__ == 1)
 /* Use alloca() for VLAs. */
-#  define VLA(type, name, size) type *name = (type *)alloca(sizeof(type) * (size))
+#  define VLA(type, name, size) type *name = alloca(sizeof(type) * (size))
 #elif !defined(__STDC_NO_VLA__) || (__STDC_NO_VLA__ == 0)
 /* Use actual C VLAs.*/
 #  define VLA(type, name, size) type name[size]