https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6802

diff --git a/MagickCore/fx.c b/MagickCore/fx.c
index 52b206da836e2bc886555cb74edc99b97e25ad04..658a666b38989ccf6d709c1e444ba90924462dad 100644 (file)
--- a/MagickCore/fx.c
+++ b/MagickCore/fx.c
@@ -1359,7 +1359,8 @@ static double FxGetSymbol(FxInfo *fx_info,const PixelChannel channel,
                 &depth,&beta,exception);
               point.x=alpha;
               point.y=beta;
-              p++;
+              if (*p != '\0')
+                p++;
             }
           else
             if (*p == '[')