osst: fix read buffer overflow

Check whether index is within bounds before testing the element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Willem Riede <osst@riede.org>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/scsi/osst.c

diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index d64b717..278b352 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -5868,7 +5868,8 @@
 	}
 
 	/* find a free minor number */
-	for (i=0; os_scsi_tapes[i] && i<osst_max_dev; i++);
+	for (i = 0; i < osst_max_dev && os_scsi_tapes[i]; i++)
+		;
 	if(i >= osst_max_dev) panic ("Scsi_devices corrupt (osst)");
 	dev_num = i;