diff mbox series

[v10,32/33] scsi: sr: Fix sshdr use in sr_get_events

Message ID 20230714213419.95492-33-michael.christie@oracle.com (mailing list archive)
State Changes Requested
Headers show
Series scsi: Allow scsi_execute users to control retries | expand

Commit Message

Mike Christie July 14, 2023, 9:34 p.m. UTC 
If scsi_execute_cmd returns < 0, it doesn't initialize the sshdr, so we
shouldn't access the sshdr. If it returns 0, then the cmd executed
successfully, so there is no need to check the sshdr. This has us access
the sshdr when get a return value > 0.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/sr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

John Garry July 27, 2023, 8:06 a.m. UTC | #1 
On 14/07/2023 22:34, Mike Christie wrote:
> If scsi_execute_cmd returns < 0, it doesn't initialize the sshdr, so we
> shouldn't access the sshdr. If it returns 0, then the cmd executed
> successfully, so there is no need to check the sshdr. This has us access
> the sshdr when get a return value > 0.
> 
> Signed-off-by: Mike Christie<michael.christie@oracle.com>
> Reviewed-by: Christoph Hellwig<hch@lst.de>

Reviewed-by: John Garry <john.g.garry@oracle.com>
diff mbox series

Patch

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 100480f5bc2c..a1889709c84c 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -177,7 +177,8 @@  static unsigned int sr_get_events(struct scsi_device *sdev)
 
 	result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf),
 				  SR_TIMEOUT, MAX_RETRIES, &exec_args);
-	if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
+	if (result > 0 && scsi_sense_valid(&sshdr) &&
+	    sshdr.sense_key == UNIT_ATTENTION)
 		return DISK_EVENT_MEDIA_CHANGE;
 
 	if (result || be16_to_cpu(eh->data_len) < sizeof(*med))