scsi: sd: Fix sshdr use in read_capacity_16

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>
Link: https://lore.kernel.org/r/20231004210013.5601-2-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>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index c92a317ba54756667ec83256fec4304cb725fac9..cc78b5e49f32b2135611883d09eda8de4b20c880 100644 (file)
--- 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 &&