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authorMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-04-28 23:51:17 +0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-04-30 19:26:05 +0200
commit1fa2337a315a2448c5434f41e00d56b01a22283c (patch)
treecdf9b79e7ac2fb2980177140951de7c317ba42db
parent[media] s5h1420: fix a buffer overflow when checking userspace params (diff)
downloadlinux-1fa2337a315a2448c5434f41e00d56b01a22283c.tar.xz
linux-1fa2337a315a2448c5434f41e00d56b01a22283c.zip
[media] cx24116: fix a buffer overflow when checking userspace params
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 Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
-rw-r--r--drivers/media/dvb-frontends/cx24116.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/media/dvb-frontends/cx24116.c b/drivers/media/dvb-frontends/cx24116.c
index 2916d7c74a1d..7bc68b355c0b 100644
--- a/drivers/media/dvb-frontends/cx24116.c
+++ b/drivers/media/dvb-frontends/cx24116.c
@@ -963,6 +963,10 @@ static int cx24116_send_diseqc_msg(struct dvb_frontend *fe,
struct cx24116_state *state = fe->demodulator_priv;
int i, ret;
+ /* Validate length */
+ if (d->msg_len > sizeof(d->msg))
+ return -EINVAL;
+
/* Dump DiSEqC message */
if (debug) {
printk(KERN_INFO "cx24116: %s(", __func__);
@@ -974,10 +978,6 @@ static int cx24116_send_diseqc_msg(struct dvb_frontend *fe,
printk(") toneburst=%d\n", toneburst);
}
- /* Validate length */
- if (d->msg_len > (CX24116_ARGLEN - CX24116_DISEQC_MSGOFS))
- return -EINVAL;
-
/* DiSEqC message */
for (i = 0; i < d->msg_len; i++)
state->dsec_cmd.args[CX24116_DISEQC_MSGOFS + i] = d->msg[i];