https://github.com/ImageMagick/ImageMagick/issues/672

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index 4bd5c972496c906c395fb0c66ad3ba15ea50077b..477527d05914c0c50204d65e49a86dc89dced3be 100644 (file)
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -4276,6 +4276,7 @@ MagickExport char *ReadBlobString(Image *image,char *string)
       {
         if (i == 0)
           return((char *) NULL);
+        string[i]='\0';
         break;
       }
     string[i]=(char) (*p);