fix pythongh-118314

zhangyoufu · Apr 26, 2024 · 1089a1d · 1089a1d
1 parent f02dbad
commit 1089a1d
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/Modules/binascii.c b/Modules/binascii.c
@@ -414,6 +414,13 @@ binascii_a2b_base64_impl(PyObject *module, Py_buffer *data, int strict_mode)
         if (this_ch == BASE64_PAD) {
             padding_started = 1;
 
+            if (strict_mode && quad_pos == 0) {
+                state = get_binascii_state(module);
+                if (state) {
+                    PyErr_SetString(state->Error, "Incorrect padding");
+                }
+                goto error_end;
+            }
             if (quad_pos >= 2 && quad_pos + ++pads >= 4) {
                 /* A pad sequence means we should not parse more input.
                 ** We've already interpreted the data from the quad at this point.