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SubjectRe: [PATCH 3/9] [SCSI] lpfc: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning
Acked-by: James Smart <james.smart@emulex.com>

Thanks

-- james


On 5/12/2011 7:50 PM, Stephen Boyd wrote:
> Enabling DEBUG_STRICT_USER_COPY_CHECKS causes the following
> warning:
>
> In file included from arch/x86/include/asm/uaccess.h:573,
> from include/linux/uaccess.h:5,
> from include/linux/highmem.h:7,
> from include/linux/pagemap.h:10,
> from include/linux/blkdev.h:12,
> from drivers/scsi/lpfc/lpfc_debugfs.c:21:
> In function 'copy_from_user':
> arch/x86/include/asm/uaccess_64.h:65:
> warning: call to 'copy_from_user_overflow' declared with
> attribute warning: copy_from_user() buffer size is not provably
> correct
>
> presumably due to buf_size being signed causing GCC to fail to
> see that buf_size can't become negative.
>
> Cc: James Smart<james.smart@emulex.com>
> Signed-off-by: Stephen Boyd<sboyd@codeaurora.org>
> ---
> drivers/scsi/lpfc/lpfc_debugfs.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
> index 3d96774..0af53a6 100644
> --- a/drivers/scsi/lpfc/lpfc_debugfs.c
> +++ b/drivers/scsi/lpfc/lpfc_debugfs.c
> @@ -1305,7 +1305,8 @@ static int lpfc_idiag_cmd_get(const char __user *buf, size_t nbytes,
> {
> char mybuf[64];
> char *pbuf, *step_str;
> - int bsize, i;
> + int i;
> + size_t bsize;
>
> /* Protect copy from user */
> if (!access_ok(VERIFY_READ, buf, nbytes))


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