commit 842acaab1376c5c84fd5966bb6070e289880e1ca
author Zackery Spytz <zspytz@gmail.com> Mon Dec 17 07:52:45 2018 -0700
committer Serhiy Storchaka <storchaka@gmail.com> Mon Dec 17 16:52:45 2018 +0200
tree f21283245b7e349d05482b89fde8d570b33c53ab
parent 4db62e115891425db2a974142a72d8eaaf95eecb

bpo-35504: Fix segfaults and SystemErrors when deleting certain attrs. (GH-11175)

Modules/cjkcodecs/multibytecodec.c

diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 938a774..f266e5f 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -133,6 +133,10 @@
     PyObject *cb;
     const char *str;
 
+    if (value == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     if (!PyUnicode_Check(value)) {
         PyErr_SetString(PyExc_TypeError, "errors must be a string");
         return -1;