[media] ttusb-dec: buffer overflow in ioctl

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>
torvalds · f2e323ec96077642d397bb1c355def536d489d16 · Dan Carpenter committed with mchehab Sep 5, 2014 · Sep 5, 2014 · f2e323e
1 parent 9380e11
commit f2e323ec96077642d397bb1c355def536d489d16
Unified Split

Showing with 3 additions and 0 deletions.

+3 −0 drivers/media/usb/ttusb-dec/ttusbdecfe.c
diff --git a/drivers/media/usb/ttusb-dec/ttusbdecfe.c b/drivers/media/usb/ttusb-dec/ttusbdecfe.c
@@ -156,6 +156,9 @@ 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,