linux-kernel - Re: [PATCH] scsi: dc395x.c: Fix for possible null pointer dereference

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Date:	Mon, 19 May 2014 13:39:53 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Ali Akcaagac <aliakc@....de>,
	Jamie Lenehan <lenehan@...bble.org>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	dc395x@...bble.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: dc395x.c:  Fix for possible null pointer
 dereference

On Sun, 2014-05-18 at 21:50 +0200, Guennadi Liakhovetski wrote:
> On Sun, 18 May 2014, Rickard Strandqvist wrote:
> 
> > There is otherwise a risk of a possible null pointer dereference.
> > 
> > Was largely found by using a static code analysis program called cppcheck.
> > 
> > Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> > ---
> >  drivers/scsi/dc395x.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
> > index 83d9bf6..0d86bc7 100644
> > --- a/drivers/scsi/dc395x.c
> > +++ b/drivers/scsi/dc395x.c
> > @@ -2637,7 +2637,7 @@ static struct ScsiReqBlk *msgin_qtag(struct AdapterCtlBlk *acb,
> >  	struct ScsiReqBlk *srb = NULL;
> >  	struct ScsiReqBlk *i;
> >  	dprintkdbg(DBG_0, "msgin_qtag: (0x%p) tag=%i srb=%p\n",
> > -		   srb->cmd, tag, srb);
> > +		   srb ? srb->cmd : 0, tag, srb);
> 
> There's not just a risk, it is a NULL-pointer dereference, so, just remove 
> it, e.g. like

Indeed. Thank you both for catching this.

	Regards
		Oliver



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