2015-06-17 11:22:20

by Maninder Singh

Subject: [PATCH 1/1] scsi: Initialize sdp after NULL check of cmnd

Currently cmnd pointer is already dereferenced before NULL check
and thus getting below warning in static analysis:
warn: variable dereferenced before check 'cmnd'

So initialize struct scsi_device *sdp after NULL check
of cmnd


Signed-off-by: Maninder Singh <[email protected]>
Reviewed-by: Akhilesh Kumar <[email protected]>
---
drivers/scsi/scsi_debug.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 1f8e2dc..bb97a5a 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -3942,7 +3942,7 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
unsigned long iflags;
int k, num_in_q, qdepth, inject;
struct sdebug_queued_cmd *sqcp = NULL;
- struct scsi_device *sdp = cmnd->device;
+ struct scsi_device *sdp;

if (NULL == cmnd || NULL == devip) {
pr_warn("%s: called with NULL cmnd or devip pointer\n",
@@ -3950,6 +3950,8 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
/* no particularly good error to report back */
return SCSI_MLQUEUE_HOST_BUSY;
}
+
+ sdp = cmnd->device;
if ((scsi_result) && (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n",
__func__, scsi_result);
--
1.7.1

2015-06-17 11:38:35

by Johannes Thumshirn

Subject: Re: [PATCH 1/1] scsi: Initialize sdp after NULL check of cmnd

On Wed, Jun 17, 2015 at 04:51:07PM +0530, Maninder Singh wrote:
> Currently cmnd pointer is already dereferenced before NULL check
> and thus getting below warning in static analysis:
> warn: variable dereferenced before check 'cmnd'
>
> So initialize struct scsi_device *sdp after NULL check
> of cmnd
>
>
> Signed-off-by: Maninder Singh <[email protected]>
> Reviewed-by: Akhilesh Kumar <[email protected]>
> ---
> drivers/scsi/scsi_debug.c | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
> index 1f8e2dc..bb97a5a 100644
> --- a/drivers/scsi/scsi_debug.c
> +++ b/drivers/scsi/scsi_debug.c
> @@ -3942,7 +3942,7 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
> unsigned long iflags;
> int k, num_in_q, qdepth, inject;
> struct sdebug_queued_cmd *sqcp = NULL;
> - struct scsi_device *sdp = cmnd->device;
> + struct scsi_device *sdp;
>
> if (NULL == cmnd || NULL == devip) {
> pr_warn("%s: called with NULL cmnd or devip pointer\n",
> @@ -3950,6 +3950,8 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
> /* no particularly good error to report back */
> return SCSI_MLQUEUE_HOST_BUSY;
> }
> +
> + sdp = cmnd->device;
> if ((scsi_result) && (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
> sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n",
> __func__, scsi_result);
> --
> 1.7.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html

Reviewed-by: Johannes Thumshirn <[email protected]>

--
Johannes Thumshirn Storage
[email protected] +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: F. Imend?rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG N?rnberg)