From 8383c44b8f408de256e248a96c3c8192f5bece1f Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Tue, 16 Jan 2018 22:48:17 +0100
Subject: [PATCH] Added extra check to avoid use of uninitialized value. Credit
 to OSS-Fuzz

---
 coders/viff.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/coders/viff.c b/coders/viff.c
index b79f2115a..d88a885d4 100644
--- a/coders/viff.c
+++ b/coders/viff.c
@@ -292,6 +292,8 @@ static Image *ReadVIFFImage(const ImageInfo *image_info,
       &viff_info.machine_dependency);
     (void) ReadBlob(image,sizeof(viff_info.reserve),viff_info.reserve);
     count=ReadBlob(image,512,(unsigned char *) viff_info.comment);
+    if (count != 512)
+      ThrowReaderException(CorruptImageError,"ImproperImageHeader");
     viff_info.comment[511]='\0';
     if (strlen(viff_info.comment) > 4)
       (void) SetImageProperty(image,"comment",viff_info.comment,exception);
-- 
2.40.0