> -----Original Message-----
> From: devel [mailto:driverdev-devel-boun...@linuxdriverproject.org] On
> Behalf Of K. Y. Srinivasan
> Sent: Monday, March 23, 2015 2:07 PM
> To: gre...@linuxfoundation.org; linux-ker...@vger.kernel.org;
> de...@linuxdriverproject.org; oher...@suse.com; jbottom...@parallels.com;
> h...@infradead.org; linux-s...@vger.kernel.org; a...@canonical.com;
> vkuzn...@redhat.com; jasow...@redhat.com
> Cc: sta...@vger.kernel.org
> Subject: [PATCH 5/7] scsi: storvsc: Fix a bug in copy_from_bounce_buffer()
>
> We may exit this function without properly freeing up the maapings we may
> have acquired. Fix the bug.
>
> Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
Reviewed-by: Long Li <lon...@microsoft.com>
> Cc: <sta...@vger.kernel.org>
> ---
> drivers/scsi/storvsc_drv.c | 15 ++++++++-------
> 1 files changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index
> 5c13eec..88f5d79 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -754,21 +754,22 @@ static unsigned int copy_to_bounce_buffer(struct
> scatterlist *orig_sgl,
> if (bounce_sgl[j].length == PAGE_SIZE) {
> /* full..move to next entry */
> sg_kunmap_atomic(bounce_addr);
> + bounce_addr = 0;
> j++;
> + }
>
> - /* if we need to use another bounce buffer */
> - if (srclen || i != orig_sgl_count - 1)
> - bounce_addr =
> sg_kmap_atomic(bounce_sgl,j);
> + /* if we need to use another bounce buffer */
> + if (srclen && bounce_addr == 0)
> + bounce_addr = sg_kmap_atomic(bounce_sgl,
> j);
>
> - } else if (srclen == 0 && i == orig_sgl_count - 1) {
> - /* unmap the last bounce that is < PAGE_SIZE
> */
> - sg_kunmap_atomic(bounce_addr);
> - }
> }
>
> sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
> }
>
> + if (bounce_addr)
> + sg_kunmap_atomic(bounce_addr);
> +
> local_irq_restore(flags);
>
> return total_copied;
> --
> 1.7.4.1
>
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> de...@linuxdriverproject.org
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