From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Fri, 13 Apr 2018 16:11:30 +0000 (+0200)
Subject: Fixed use of uninitialized value (https://oss-fuzz.com/v2/testcase-detail/63203099017... 
X-Git-Tag: 7.0.7-29~120
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7462388ac5fce6c5829b3cf1e0e26dc97116fe39;p=imagemagick

Fixed use of uninitialized value (https://oss-fuzz.com/v2/testcase-detail/6320309901721600).
---

diff --git a/coders/pnm.c b/coders/pnm.c
index 08c1989cb..66ca8afc0 100644
--- a/coders/pnm.c
+++ b/coders/pnm.c
@@ -301,8 +301,8 @@ static Image *ReadPNMImage(const ImageInfo *image_info,ExceptionInfo *exception)
             char
               scale[MagickPathExtent];
 
-            (void) ReadBlobString(image,scale);
-            quantum_scale=StringToDouble(scale,(char **) NULL);
+            if (ReadBlobString(image,scale) != (char *) NULL)
+              quantum_scale=StringToDouble(scale,(char **) NULL);
           }
         else
           {