Commit 9bd2b656 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab Committed by Luis Henriques

[media] cx24116: fix a buffer overflow when checking userspace params

commit 1fa2337a upstream.

The maximum size for a DiSEqC command is 6, according to the
userspace API. However, the code allows to write up much more values:
	drivers/media/dvb-frontends/cx24116.c:983 cx24116_send_diseqc_msg() error: buffer overflow 'd->msg' 6 <= 23
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 8bb9deaa
...@@ -963,6 +963,10 @@ static int cx24116_send_diseqc_msg(struct dvb_frontend *fe, ...@@ -963,6 +963,10 @@ static int cx24116_send_diseqc_msg(struct dvb_frontend *fe,
struct cx24116_state *state = fe->demodulator_priv; struct cx24116_state *state = fe->demodulator_priv;
int i, ret; int i, ret;
/* Validate length */
if (d->msg_len > sizeof(d->msg))
return -EINVAL;
/* Dump DiSEqC message */ /* Dump DiSEqC message */
if (debug) { if (debug) {
printk(KERN_INFO "cx24116: %s(", __func__); printk(KERN_INFO "cx24116: %s(", __func__);
...@@ -974,10 +978,6 @@ static int cx24116_send_diseqc_msg(struct dvb_frontend *fe, ...@@ -974,10 +978,6 @@ static int cx24116_send_diseqc_msg(struct dvb_frontend *fe,
printk(") toneburst=%d\n", toneburst); printk(") toneburst=%d\n", toneburst);
} }
/* Validate length */
if (d->msg_len > (CX24116_ARGLEN - CX24116_DISEQC_MSGOFS))
return -EINVAL;
/* DiSEqC message */ /* DiSEqC message */
for (i = 0; i < d->msg_len; i++) for (i = 0; i < d->msg_len; i++)
state->dsec_cmd.args[CX24116_DISEQC_MSGOFS + i] = d->msg[i]; state->dsec_cmd.args[CX24116_DISEQC_MSGOFS + i] = d->msg[i];
......
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