From 5def1e993fef731a151b08afa08f9bcab7b1071b Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Fri, 1 Jun 2018 18:26:05 -0400
Subject: [PATCH] ...

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

diff --git a/coders/png.c b/coders/png.c
index cc9693fa4..8b78bdf7c 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -4970,13 +4970,15 @@ static Image *ReadOneJNGImage(MngInfo *mng_info,
     {
       assert(color_image == (Image *) NULL);
       assert(alpha_image == (Image *) NULL);
+      if (color_image != (Image *) NULL)
+        color_image=DestroyImageList(color_image);
       return(DestroyImageList(image));
     }
 
   if (color_image == (Image *) NULL)
     {
       assert(alpha_image == (Image *) NULL);
-      return(DestroyImageList(image));
+      ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
     }
 
   (void) SeekBlob(color_image,0,SEEK_SET);
-- 
2.40.0