linux-kernel - Re: [Linux-fbdev-devel] [PATCH 5/15] skeletonfb: check fb_alloc_cmap return value and handle failure properly

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Date:	Mon, 9 Feb 2009 17:32:00 -0500
From:	Andres Salomon <dilinger@...ued.net>
To:	Krzysztof Helt <krzysztof.h1@...zta.fm>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, adaplas@...il.com
Subject: Re: [Linux-fbdev-devel] [PATCH 5/15] skeletonfb: check
 fb_alloc_cmap return value and handle failure properly

On Mon, 9 Feb 2009 07:29:29 +0100
Krzysztof Helt <krzysztof.h1@...zta.fm> wrote:

> On Sat, 7 Feb 2009 12:13:02 -0500
> Andres Salomon <dilinger@...ued.net> wrote:
> 
> > 
> > Bad example code, no cookie!
> > 
> 
> It is even worse than you thought.

Maybe skeletonfb.c should simply be dropped completely?  Incorrect
documentation is worse than no documentation.  If it's unmaintained,
buggy, and incorrect in many places...



> 
> > Signed-off-by: Andres Salomon <dilinger@...ian.org>
> > ---
> >  drivers/video/skeletonfb.c |    9 ++++++---
> >  1 files changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/video/skeletonfb.c b/drivers/video/skeletonfb.c
> > index df53365..a439159 100644
> > --- a/drivers/video/skeletonfb.c
> > +++ b/drivers/video/skeletonfb.c
> > @@ -795,8 +795,9 @@ static int __devinit xxxfb_probe(struct pci_dev
> > *dev, if (!retval || retval == 4)
> >  	return -EINVAL;			
> >  
> > -    /* This has to been done !!! */	
> > -    fb_alloc_cmap(&info->cmap, cmap_len, 0);
> > +    /* This has to be done! */
> > +    if (fb_alloc_cmap(&info->cmap, cmap_len, 0))
> > +	return -ENOMEM;
> >  	
> 
> The info pointer should be freed before the return here ...
> 
> >      /* 
> >       * The following is done in the case of having hardware with a
> > static @@ -820,8 +821,10 @@ static int __devinit xxxfb_probe(struct
> > pci_dev *dev, */
> >      /* xxxfb_set_par(info); */
> >  
> > -    if (register_framebuffer(info) < 0)
> > +    if (register_framebuffer(info) < 0) {
> > +	fb_dealloc_cmap(&info->cmap);
> 
> ... and here.
> 
> >  	return -EINVAL;
> > +    }
> >      printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
> >  	   info->fix.id);
> >      pci_set_drvdata(dev, info); /* or platform_set_drvdata(pdev,
> > info) */ -- 
> 
> 
> Kind regards,
> Krzysztof
> 
> 
> ----------------------------------------------------------------------
> Zostan mistrzem parkowania w Bombaju!
> Zagraj >> http://link.interia.pl/f204e 
> 
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