linux-kernel - Re: [patch] [SCSI] scsi_transport_sas: check for allocation failure

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Date:	Fri, 08 Mar 2013 22:50:19 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	dgilbert@...erlog.com
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] [SCSI] scsi_transport_sas: check for allocation failure

On Fri, 2013-03-08 at 12:57 -0500, Douglas Gilbert wrote:
> On 13-03-08 07:02 AM, Dan Carpenter wrote:
> > Static checkers complain that this allocation isn't checked.  We
> > should return zero if the allocation fails.
> >
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> >
> > diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
> > index 1b68142..a022997 100644
> > --- a/drivers/scsi/scsi_transport_sas.c
> > +++ b/drivers/scsi/scsi_transport_sas.c
> > @@ -379,9 +379,12 @@ sas_tlr_supported(struct scsi_device *sdev)
> >   {
> >   	const int vpd_len = 32;
> >   	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
> > -	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
> > +	char *buffer;
> >   	int ret = 0;
> >
> > +	buffer = kzalloc(vpd_len, GFP_KERNEL);
> > +	if (!buffer)
> > +		goto out;
> >   	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
> >   		goto out;
> >
> 
> For 32 bytes, why not use the stack?

Because the buffer is a DMA target.  You can't DMA to stack because of
padding and cacheline issues.

James


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