From 953cd881965c232bd71cdad8299892f4c3c5d8ee Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Thu, 1 Feb 2018 17:59:40 -0500
Subject: [PATCH] https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5869

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

diff --git a/MagickCore/fx.c b/MagickCore/fx.c
index 954b69514..c62f56800 100644
--- a/MagickCore/fx.c
+++ b/MagickCore/fx.c
@@ -1872,11 +1872,11 @@ static const char *FxOperatorPrecedence(const char *expression,
   size_t
     level;
 
-  c=0;
+  c=(-1);
   level=0;
   subexpression=(const char *) NULL;
   target=NullPrecedence;
-  while (*expression != '\0')
+  while ((c != '\0') && (*expression != '\0'))
   {
     precedence=UndefinedPrecedence;
     if ((isspace((int) ((unsigned char) *expression)) != 0) || (c == (int) '@'))
-- 
2.40.0