Fix out of bounds read in long_new() for empty bytes with an explicit base. int(b'', somebase) calls PyLong_FromString() with char* of length 1 but the function accesses the first argument at offset 1. CID 715359
diff --git a/Objects/longobject.c b/Objects/longobject.c
index a735e33..f2f63af 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -4149,8 +4149,8 @@
string = PyByteArray_AS_STRING(x);
else
string = PyBytes_AS_STRING(x);
- if (strlen(string) != (size_t)size) {
- /* We only see this if there's a null byte in x,
+ if (strlen(string) != (size_t)size || !size) {
+ /* We only see this if there's a null byte in x or x is empty,
x is a bytes or buffer, *and* a base is given. */
PyErr_Format(PyExc_ValueError,
"invalid literal for int() with base %d: %R",