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media: ttusb-dec: buffer overflow in ioctl 

commit f2e323ec96 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>
This commit is contained in:
Dan Carpenter 2014-09-05 09:09:28 -03:00 committed by Greg Kroah-Hartman
parent 215894c980
commit c8e0fd4818
1 changed files with 3 additions and 0 deletions
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3
drivers/media/usb/ttusb-dec/ttusbdecfe.c
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@ -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,