From db78c9b75e1574ec87f1e7ab8e8e6c835744bf2d Mon Sep 17 00:00:00 2001
From: Aarti Parikh <aparikh@fastly.com>
Date: Tue, 21 Jun 2016 17:47:08 -0700
Subject: [PATCH] Take care to not dereference the original image a second time

---
 vips.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/vips.go b/vips.go
index ba68cba..6b74199 100644
--- a/vips.go
+++ b/vips.go
@@ -318,7 +318,12 @@ func vipsSave(image *C.VipsImage, o vipsSaveOptions) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer C.g_object_unref(C.gpointer(tmpImage))
+	//When an image has an unsupported color space, vipsPreSave returns the pointer of the image passed to it unmodified.
+	//When this occurs, we must take care to not dereference the original image a second time;
+	//we may otherwise erroneously free the object twice
+	if tmpImage != image {
+		defer C.g_object_unref(C.gpointer(tmpImage))
+	}
 
 	length := C.size_t(0)
 	saveErr := C.int(0)