[PATCH 4.9 128/191] scsi: scsi_devinfo: handle non-terminated strings

Sasha Levin
2020-06-29T20:29:31Z

From: Martin Wilck <mwilck@suse.com>

commit ba69ead9e9e9bb3cec5faf03526c36764ac8942a upstream.

devinfo->vendor and devinfo->model aren't necessarily
zero-terminated.

Fixes: b8018b973c7c "scsi_devinfo: fixup string compare"
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/scsi_devinfo.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index d596b76eea641..aad9195b356a8 100644
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -451,7 +451,8 @@ static struct scsi_dev_info_list *scsi_dev_info_list_find(const char *vendor,
/*
* vendor strings must be an exact match
*/
- if (vmax != strlen(devinfo->vendor) ||
+ if (vmax != strnlen(devinfo->vendor,
+ sizeof(devinfo->vendor)) ||
memcmp(devinfo->vendor, vskip, vmax))
continue;

@@ -459,7 +460,7 @@ static struct scsi_dev_info_list *scsi_dev_info_list_find(const char *vendor,
* @model specifies the full string, and
* must be larger or equal to devinfo->model
*/
- mlen = strlen(devinfo->model);
+ mlen = strnlen(devinfo->model, sizeof(devinfo->model));
if (mmax < mlen || memcmp(devinfo->model, mskip, mlen))
continue;
return devinfo;
--
2.25.1