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

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Date:	Tue, 20 May 2014 23:20:01 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	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

Okay, good!
Or, do I need to do anything else :-)

Best regards
Rickard Strandqvist


2014-05-19 13:39 GMT+02:00 Oliver Neukum <oneukum@...e.de>:
> 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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