From 2ed3b5080980781d53c9f50aed97934c0f589474 Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Thu, 11 May 2017 10:42:15 +0100
Subject: [PATCH] utils.c: Raise exceptions from `convTHING' with null
 arguments.

This can happen as a result of using `convTHING' in an attribute `set'
function, and the Python program trying to `del' the attribute.
Unfortunately, these conversion functions are already being used in this
context, and it leads to segfaults, e.g., from

  del C.Key(C.KeyFile('', C.KOPEN_WRITE | C.KOPEN_NOFILE), 0, 'k').exptime

Easy fix.
---
 util.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/util.c b/util.c
index d4b7fb0..7118bfb 100644
--- a/util.c
+++ b/util.c
@@ -133,6 +133,7 @@ int convk64(PyObject *o, void *pp)
   int rc = 0;
   uint32 lo, hi;
 
+  if (!o) VALERR("can't delete");
   if (init_i32()) goto end;
   if ((i = PyNumber_Int(o)) == 0) goto end;
   lo = PyInt_AsUnsignedLongMask(i);
-- 
2.11.0