Issue #21951: Fixed a crash in Tkinter on AIX when called Tcl command with
empty string or tuple argument.
On some platforms Tcl memory allocator returns NULL when allocating zero-sized
block of memory.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index d0a4464..acc0110 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -1052,6 +1052,8 @@
Py_ssize_t size, i;
size = PyTuple_Size(value);
+ if (size == 0)
+ return Tcl_NewListObj(0, NULL);
if (!CHECK_SIZE(size, sizeof(Tcl_Obj *))) {
PyErr_SetString(PyExc_OverflowError, "tuple is too long");
return NULL;
@@ -1075,6 +1077,8 @@
Tcl_UniChar *outbuf = NULL;
Py_ssize_t i;
size_t allocsize;
+ if (size == 0)
+ return Tcl_NewUnicodeObj((const void *)"", 0);
if (!CHECK_SIZE(size, sizeof(Tcl_UniChar))) {
PyErr_SetString(PyExc_OverflowError, "string is too long");
return NULL;