sr: need to check whether sshdr is valid in sr_do_ioctl

hulk inclusion
category: bugfix
bugzilla: 23457
CVE: NA

---------------------------

Like other callers of scsi_execute(send_trespass_cmd, hp_sw_tur...),
we need to check whether sshdr is valid.
Signed-off-by: Nzhengbin <zhengbin13@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/scsi/sr_ioctl.c

@@ -206,6 +206,11 @@ int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
 
 	/* Minimal error checking.  Ignore cases we know about, and report the rest. */
 	if (driver_byte(result) != 0) {
+		if (!scsi_sense_valid(sshdr)) {
+			err = -EIO;
+			goto out;
+		}
+
 		switch (sshdr->sense_key) {
 		case UNIT_ATTENTION:
 			SDev->changed = 1;