Verify heappop argument is a list.

diff --git a/Modules/heapqmodule.c b/Modules/heapqmodule.c
index 8a6a4f5cc13df856ca92656299497c74bef3378f..629f516457c1c9d93a54697d6b914124a02aef12 100644 (file)
--- a/Modules/heapqmodule.c
+++ b/Modules/heapqmodule.c
@@ -119,6 +119,11 @@ heappop(PyObject *self, PyObject *heap)
        PyObject *lastelt, *returnitem;
        int n;
 
+       if (!PyList_Check(heap)) {
+               PyErr_SetString(PyExc_ValueError, "heap argument must be a list");
+               return NULL;
+       }
+
        /* # raises appropriate IndexError if heap is empty */
        n = PyList_GET_SIZE(heap);
        if (n == 0) {