Fix null pointer dereferencing in structmember.c PyMember_SetOne() for T_CHAR. _PyUnicode_AsStringAndSize() can return NULL without touching the len argument. Also remove unnecessary PyUnicode_Check(), _PyUnicode_AsStringAndSize() performance the test again. CID 486815

1 files changed, 1 insertions, 5 deletions

diff --git a/Python/structmember.c b/Python/structmember.c
index ddedea5419..af0296d802 100644
--- a/Python/structmember.c
+++ b/Python/structmember.c
@@ -254,12 +254,8 @@ PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
         char *string;
         Py_ssize_t len;
 
-        if (!PyUnicode_Check(v)) {
-            PyErr_BadArgument();
-            return -1;
-        }
         string = _PyUnicode_AsStringAndSize(v, &len);
-        if (len != 1) {
+        if (string == NULL || len != 1) {
             PyErr_BadArgument();
             return -1;
         }