diff mbox series

[v11,06/34] scsi: sd: Fix sshdr use in read_capacity_16

Message ID 20230905231547.83945-7-michael.christie@oracle.com
State Superseded
Headers show
Series [v11,01/34] scsi: Add helper to prep sense during error handling | expand

Commit Message

Mike Christie Sept. 5, 2023, 11:15 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 we 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>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/scsi/sd.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Comments

Martin Wilck Sept. 15, 2023, 8:13 p.m. UTC | #1 
On Tue, 2023-09-05 at 18:15 -0500, 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 we 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>
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Reviewed-by: Martin Wilck <mwilck@suse.com>
diff mbox series

Patch

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 4cd281368826..70178c1f3f8e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2388,11 +2388,10 @@  static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
 		the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN,
 					      buffer, RC16_LEN, SD_TIMEOUT,
 					      sdkp->max_retries, &exec_args);
-
-		if (media_not_present(sdkp, &sshdr))
-			return -ENODEV;
-
 		if (the_result > 0) {
+			if (media_not_present(sdkp, &sshdr))
+				return -ENODEV;
+
 			sense_valid = scsi_sense_valid(&sshdr);
 			if (sense_valid &&
 			    sshdr.sense_key == ILLEGAL_REQUEST &&