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SubjectRe: [PATCH resend] isd200: Allocate sense_buffer for hacked up scsi_cmnd
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On Wed, 2008-03-12 at 17:24 +0200, Boaz Harrosh wrote:
> On Wed, Mar 12 2008 at 17:10 +0200, Alan Stern <stern@rowland.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@rowland.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@panasas.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@panasas.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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