From 3776836f675f3d52b21713a45460f09a03af15df Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Wed, 5 Oct 2016 23:29:07 -0700
Subject: do not leak buffer if mmap is not writable

---
 Modules/mmapmodule.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 6e2db61..e01de44 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -383,8 +383,10 @@ mmap_write_method(mmap_object *self,
     if (!PyArg_ParseTuple(args, "y*:write", &data))
         return(NULL);
 
-    if (!is_writable(self))
+    if (!is_writable(self)) {
+        PyBuffer_Release(&data);
         return NULL;
+    }
 
     if (self->pos > self->size || self->size - self->pos < data.len) {
         PyBuffer_Release(&data);
-- 
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