Issue #13546: Fixed an overflow issue that could crash the intepreter when
calling sys.setrecursionlimit((1<<31)-1).
2.7 only.
diff --git a/Python/errors.c b/Python/errors.c
index 4294f2f..64ba05d 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -111,9 +111,11 @@
PyErr_Fetch(&exception, &value, &tb);
/* Temporarily bump the recursion limit, so that in the most
common case PyObject_IsSubclass will not raise a recursion
- error we have to ignore anyway. */
+ error we have to ignore anyway. Don't do it when the limit
+ is already insanely high, to avoid overflow */
reclimit = Py_GetRecursionLimit();
- Py_SetRecursionLimit(reclimit + 5);
+ if (reclimit < (1 << 30))
+ Py_SetRecursionLimit(reclimit + 5);
res = PyObject_IsSubclass(err, exc);
Py_SetRecursionLimit(reclimit);
/* This function must not fail, so print the error here */