Memory leak in ReadPSImage in coder/ps.c

[YangY-Xiao]

Prerequisites

• [ Y ] I have written a descriptive issue title
• [ Y ] I have verified that I am using the latest version of ImageMagick
• [ Y ] I have searched open and closed issues to ensure it has not already been reported

Description

There is a memory leak issue in ReadPSImage in coder/ps.c

      page_geometry=GetPageGeometry(option);
      flags=ParseMetaGeometry(page_geometry,&page.x,&page.y,&page.width,
        &page.height);
      if (flags == NoValue)
        {
          (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
            "InvalidGeometry","`%s'",option);
          image=DestroyImage(image);
          return((Image *) NULL);
        }
      page.width=(size_t) ceil((double) (page.width*image->resolution.x/delta.x)
        -0.5);
      page.height=(size_t) ceil((double) (page.height*image->resolution.y/
        delta.y) -0.5);
      page_geometry=DestroyString(page_geometry);
      fitPage=MagickTrue;

https://github.com/ImageMagick/ImageMagick/blob/master/coders/ps.c#L740

It is possible that page_geometry is not destroyed since there is a return statement before it.
It is the issue which is similar to the one fixed in 15be797

[urban-warrior]

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ http://www.imagemagick.org/download/beta/ by sometime tomorrow.

[nohmask]

This was assigned CVE-2019-13137.