[PATCH 3.17 110/141] media: ttusb-dec: buffer overflow in ioctl

Greg Kroah-Hartman
2014-11-19T20:58:07Z

From: Dan Carpenter <dan.carpenter@oracle.com>

commit f2e323ec96077642d397bb1c355def536d489d16 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/media/usb/ttusb-dec/ttusbdecfe.c | 3 +++
1 file changed, 3 insertions(+)

--- 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_m
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,