From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Thu, 11 Jan 2018 22:50:42 +0000 (+0100)
Subject: Added check to avoid use of uninitialized value.
X-Git-Tag: 7.0.7-22~104
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e9af08440ac1a5c1583e12a925e7e966a8c1ea64;p=imagemagick

Added check to avoid use of uninitialized value.
Credit to OSS-Fuzz
---

diff --git a/coders/pgx.c b/coders/pgx.c
index 81165a637..dc91462e2 100644
--- a/coders/pgx.c
+++ b/coders/pgx.c
@@ -182,6 +182,8 @@ static Image *ReadPGXImage(const ImageInfo *image_info,ExceptionInfo *exception)
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   count=(ssize_t) sscanf(buffer,"PG%[ \t]%2s%[ \t+-]%d%[ \t]%d%[ \t]%d",sans,
     endian,sign,&precision,sans,&width,sans,&height);
+  if (count != 8)
+    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   image->depth=(size_t) precision;
   if (LocaleCompare(endian,"ML") == 0)
     image->endian=MSBEndian;