From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Date: Wed, 24 Aug 2022 07:00:24 +0000 (+0200)
Subject: media: tc358743: limit msg.len to CEC_MAX_MSG_SIZE
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3028fb90f5b972ef9b9e68e75a8372b8f9a8e312;p=linux.git

media: tc358743: limit msg.len to CEC_MAX_MSG_SIZE

I expect that the hardware will have limited this to 16, but just in
case it hasn't, check for this corner case.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index e18b8947ad7e5..804b8ee8e4aba 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -964,6 +964,8 @@ static void tc358743_cec_handler(struct v4l2_subdev *sd, u16 intstatus,
 
 		v = i2c_rd32(sd, CECRCTR);
 		msg.len = v & 0x1f;
+		if (msg.len > CEC_MAX_MSG_SIZE)
+			msg.len = CEC_MAX_MSG_SIZE;
 		for (i = 0; i < msg.len; i++) {
 			v = i2c_rd32(sd, CECRBUF1 + i * 4);
 			msg.msg[i] = v & 0xff;