linux-kernel - [PATCH AUTOSEL 5.10 04/14] media: cros-ec-cec: limit msg.len to CEC_MAX_MSG

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Message-Id: <20221101113012.800271-4-sashal@kernel.org>
Date:   Tue,  1 Nov 2022 07:30:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sasha Levin <sashal@...nel.org>, bleung@...omium.org,
        groeck@...omium.org, ajye_huang@...pal.corp-partner.google.com,
        hellojacky0226@...mail.com, zhuohao@...omium.org,
        scott_chao@...tron.corp-partner.google.com,
        linux-media@...r.kernel.org, chrome-platform@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.10 04/14] media: cros-ec-cec: limit msg.len to CEC_MAX_MSG_SIZE

From: Hans Verkuil <hverkuil-cisco@...all.nl>

[ Upstream commit 2dc73b48665411a08c4e5f0f823dea8510761603 ]

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@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/cec/platform/cros-ec/cros-ec-cec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
index 2d95e16cd248..f66699d5dc66 100644
--- a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
+++ b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
@@ -44,6 +44,8 @@ static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
 	uint8_t *cec_message = cros_ec->event_data.data.cec_message;
 	unsigned int len = cros_ec->event_size;
 
+	if (len > CEC_MAX_MSG_SIZE)
+		len = CEC_MAX_MSG_SIZE;
 	cros_ec_cec->rx_msg.len = len;
 	memcpy(cros_ec_cec->rx_msg.msg, cec_message, len);
 
-- 
2.35.1