[PATCH 2/4] ses: check return code from ses_recv_diag()

[Hannes Reinecke <hare@suse.de>]

We should be checking the return code from ses_recv_diag() to
avoid accessing invalid data.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---
 drivers/scsi/ses.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ses.c b/drivers/scsi/ses.c
index a37aec8..fc70c00 100644
--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -179,7 +179,8 @@ static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
 	unsigned char *type_ptr = ses_dev->page1_types;
 	unsigned char *desc_ptr = ses_dev->page2 + 8;
 
-	ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
+	if (ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len) < 0)
+		return NULL;
 
 	for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 		for (j = 0; j < type_ptr[1]; j++) {
-- 
1.8.5.6