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scsi_debug: schedule_resp fix input variable check

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The function should never be called with cmnd NULL so
put a fat WARN there.
Fix also smatch wraning:
schedule_resp() warn: variable dereferenced before check 'cmnd'

Signed-off-by: Tomas Winkler <[email protected]>
Acked-by: Douglas Gilbert <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Tomas Winkler 2015-07-28 16:54:24 +03:00 • committed by James Bottomley
commit 299b6c07ea
1 changed files with 10 additions and 3 deletions
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13
drivers/scsi/scsi_debug.c
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@ -3941,13 +3941,20 @@ 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("called with NULL cmnd or devip pointer\n");
/* this should never happen */
if (WARN_ON(!cmnd))
return SCSI_MLQUEUE_HOST_BUSY;
if (NULL == devip) {
pr_warn("called devip == NULL\n");
/* 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);