From cf3b576d52c1f0a204f0c8bdecc22a338f7ca5a4 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 9 Sep 2014 09:05:28 -0300 Subject: [PATCH] [media] dvb: si21xx: buffer overflow in si21_writeregs() "len" is user controlled and can be up to 255. Anything more than 59 will cause a buffer overflow so we need to add a test for that. Signed-off-by: Dan Carpenter Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/si21xx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/media/dvb-frontends/si21xx.c b/drivers/media/dvb-frontends/si21xx.c index 73b47cc6a13b..16850e2bf02f 100644 --- a/drivers/media/dvb-frontends/si21xx.c +++ b/drivers/media/dvb-frontends/si21xx.c @@ -236,6 +236,9 @@ static int si21_writeregs(struct si21xx_state *state, u8 reg1, .len = len + 1 }; + if (len > sizeof(buf) - 1) + return -EINVAL; + msg.buf[0] = reg1; memcpy(msg.buf + 1, data, len);