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Date: Sun, 13 Aug 2000 13:10:26 +1000 (EST)
From: andrew@ugh.net.au
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Subject: bin/20569: libvgl tries to free global array
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>Number:         20569
>Category:       bin
>Synopsis:       libvgl tries to free global array
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Aug 12 20:10:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Andrew
>Release:        FreeBSD 4.0-STABLE i386
>Organization:
UgH!
>Environment:

4.1-STABLE a week or so old

>Description:

I have a program trying to use libvgl. When VGLInit is called it calls
VGLTextSetFontFile((byte *)0). This causes VGLTextFont to point to some
allocated memory and VGLTextFont->BitmapArray to point to VGLFont which is a
global array defined in text.c.

Later, when my program calls VGLTextSetFontFile VGLTextSetFontFile tries to
free this array causing "free(): warning: junk pointer, too high to make sense"

Also there are a few style(9) things...specifically the use of (type *)0 rather
than NULL.

>How-To-Repeat:

if (VGLInit(VIDEO_MODE) != 0) {
        err(EX_UNAVAILABLE, "failed to initialise video display");
}

if (VGLTextSetFontFile(FONT) != 0) {
	reset_and_err(EX_UNAVAILABLE, "failed to load font (%s)", FONT);
}

>Fix:

I guess a flag needs to be set to indicate if the builtin font is being used
or a user set font. There may be a better way.

>Release-Note:
>Audit-Trail:
>Unformatted:


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