s390/vmlogrdr: fix array access in vmlogrdr_open()

heicarst · Martin Schwidefsky · commit 9784bd4f1a6e · 2013-10-15T13:47:59.000+02:00
Fix check within vmlogrdr_open() if the minor address is not larger
than the number of array elements.

Found with "smatch":

drivers/s390/char/vmlogrdr.c:318 vmlogrdr_open() warn:
  buffer overflow 'sys_ser' 3 &lt;= 3

Acked-by: Stefan Weinhuber &lt;wein@de.ibm.com&gt;
Signed-off-by: Heiko Carstens &lt;heiko.carstens@de.ibm.com&gt;
Signed-off-by: Martin Schwidefsky &lt;schwidefsky@de.ibm.com&gt;
diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
@@ -313,7 +313,7 @@ static int vmlogrdr_open (struct inode *inode, struct file *filp)
 	int ret;
 
 	dev_num = iminor(inode);
-	if (dev_num > MAXMINOR)
+	if (dev_num >= MAXMINOR)
 		return -ENODEV;
 	logptr = &sys_ser[dev_num];
 
