[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Pine.LNX.4.64.1405182147500.23804@axis700.grange>
Date: Sun, 18 May 2014 21:50:42 +0200 (CEST)
From: Guennadi Liakhovetski <g.liakhovetski@....de>
To: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
cc: Oliver Neukum <oliver@...kum.org>, 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, 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
> - dprintkdbg(DBG_0, "msgin_qtag: (0x%p) tag=%i srb=%p\n",
> - srb->cmd, tag, srb);
> + dprintkdbg(DBG_0, "msgin_qtag: tag=%i\n", tag);
Thanks
Guennadi
> if (!(dcb->tag_mask & (1 << tag)))
> dprintkl(KERN_DEBUG,
> --
> 1.7.10.4
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists