From 71ba1de373d4c15527a60b908594f1ab3bfa9e37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luis=20=C3=81ngel=20San=20Mart=C3=ADn?=
 <luisangelsm@gmail.com>
Date: Tue, 26 Apr 2016 16:17:54 +0200
Subject: [PATCH] prevent crash is something goes wrong processing a PDF in OSX

---
 common/pdf_comic.mm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/common/pdf_comic.mm b/common/pdf_comic.mm
index 7f9b32ce..3eda1c07 100644
--- a/common/pdf_comic.mm
+++ b/common/pdf_comic.mm
@@ -97,6 +97,15 @@ QImage MacOSXPDFComic::getPage(const int pageNum)
 
     lastPageData = (void *)dataRef;
 
+    if(!lastPageData)
+    {
+        QLOG_ERROR() << "Unable to extract image from PDF file using CGPDFDocument";
+        CGImageRelease(image);
+        CGContextRelease(bitmapContext);
+        CGColorSpaceRelease(genericColorSpace);
+        return QImage();
+    }
+
     const uchar *bytes = (const uchar *)CFDataGetBytePtr(dataRef);
 
     qtImage = QImage(bytes, pageRect.size.width, pageRect.size.height, QImage::Format_ARGB32);