From 7462388ac5fce6c5829b3cf1e0e26dc97116fe39 Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Fri, 13 Apr 2018 18:11:30 +0200
Subject: [PATCH] Fixed use of uninitialized value
 (https://oss-fuzz.com/v2/testcase-detail/6320309901721600).

---
 coders/pnm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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
           {
-- 
2.40.0