linux-kernel - Re: [PATCH resend] isd200: Allocate sense_buffer for hacked up scsi

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Date:	Wed, 12 Mar 2008 11:54:44 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	Sven Schnelle <svens@...ckframe.org>,
	linux-kernel@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH resend] isd200: Allocate sense_buffer for hacked up
	scsi_cmnd

On Wed, 2008-03-12 at 17:24 +0200, Boaz Harrosh wrote:
> On Wed, Mar 12 2008 at 17:10 +0200, Alan Stern <stern@...land.harvard.edu> wrote:
> > On Wed, 12 Mar 2008, Boaz Harrosh wrote:
> > 
> >> Since the separation of sense_buffer from scsi_cmnd, Drivers that hack their
> >> own struct scsi_cmnd like here isd200, must also take care of their own
> >> sense_buffer.
> > 
> > Did you run this through checkpatch?
> > 
> > Acked-by: Alan Stern <stern@...land.harvard.edu>
> > 
> > Alan Stern
> > 
> > --
> No I did not, Thanks. Here it is again. 
> Again this is for 2.6.25 rc-fixes a NULL dereference bugfix!
>  
> ---
> From: Boaz Harrosh <bharrosh@...asas.com>
> Date: Tue, 11 Mar 2008 17:23:06 +0200
> Subject: [PATCH] isd200: Allocate sense_buffer for hacked up scsi_cmnd
> 
> Since the separation of sense_buffer from scsi_cmnd, Drivers that hack their
> own struct scsi_cmnd like here isd200, must also take care of their own
> sense_buffer.
> 
> Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
> ---
>  drivers/usb/storage/isd200.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c
> index 2ae1e86..ac1764b 100644
> --- a/drivers/usb/storage/isd200.c
> +++ b/drivers/usb/storage/isd200.c
> @@ -294,6 +294,7 @@ struct isd200_info {
>  	unsigned char MaxLUNs;
>  	struct scsi_cmnd srb;
>  	struct scatterlist sg;
> +	u8 *sense_buffer;

There's no real need to add this parameter, since all you're doing is
assigning it to srb.sense_buffer, there's no need to have an extra
pointer for it.

>  };
>  
> 
> @@ -1469,6 +1470,7 @@ static void isd200_free_info_ptrs(void *info_)
>  	if (info) {
>  		kfree(info->id);
>  		kfree(info->RegsBuf);
> +		kfree(info->sense_buffer);
>  	}
>  }
>  
> @@ -1494,11 +1496,13 @@ static int isd200_init_info(struct us_data *us)
>  				kzalloc(sizeof(struct hd_driveid), GFP_KERNEL);
>  		info->RegsBuf = (unsigned char *)
>  				kmalloc(sizeof(info->ATARegs), GFP_KERNEL);
> -		if (!info->id || !info->RegsBuf) {
> +		info->sense_buffer = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
                                        ^ kzalloc is probably best
> +		if (!info->id || !info->RegsBuf || !info->sense_buffer) {
>  			isd200_free_info_ptrs(info);
>  			kfree(info);

Needs to be a kfree(info->sense_buffer) to avoid leaks if the others
couldn't allocate ... it also looks like there are missing
kfree(info->id) and (info->RegsBuf) that fix leaks that aren't part of
this patch.

>  			retStatus = ISD200_ERROR;
> -		}
> +		} else
> +			info->srb.sense_buffer = info->sense_buffer;
>  	}
>  
>  	if (retStatus == ISD200_GOOD) {

James


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