ttusb-dec: buffer overflow in ioctl

commit dc0ab1ddeb0c5f5eb3f37a72eadb394792b3c40d upstream

We need to add a limit check here so we don't overflow the buffer.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
(backported from commit f2e323ec)
CVE-2014-8884
BugLink: http://bugs.launchpad.net/bugs/1395187Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

drivers/media/dvb/ttusb-dec/ttusbdecfe.c

@@ -154,6 +154,9 @@ static int ttusbdecfe_dvbs_diseqc_send_master_cmd(struct dvb_frontend* fe, struc
 		   0x00, 0x00, 0x00, 0x00,
 		   0x00, 0x00 };
 
+	if (cmd->msg_len > sizeof(b) - 4)
+		return -EINVAL;
+
 	memcpy(&b[4], cmd->msg, cmd->msg_len);
 
 	state->config->send_command(fe, 0x72,