[PATCH 4.4 108/115] scsi: sd: change manage_start_stop to bool in sysfs interface

Greg Kroah-Hartman
2017-12-18T15:57:15Z

From: weiping zhang <zhangweiping@didichuxing.com>

[ Upstream commit 623401ee33e42cee64d333877892be8db02951eb ]

/sys/class/scsi_disk/0:2:0:0/manage_start_stop can be changed to 0
unexpectly by writing an invalid string.

Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/sd.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -233,11 +233,15 @@ manage_start_stop_store(struct device *d
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
+ bool v;

if (!capable(CAP_SYS_ADMIN))
return -EACCES;

- sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
+ if (kstrtobool(buf, &v))
+ return -EINVAL;
+
+ sdp->manage_start_stop = v;

return count;
}