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media: cros-ec-cec: limit msg.len to CEC_MAX_MSG_SIZE

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[ Upstream commit 2dc73b4866 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans Verkuil 2022-08-24 09:06:19 +02:00 committed by Greg Kroah-Hartman
parent 1609231f86
commit 7fdc58d8c2
1 changed files with 2 additions and 0 deletions
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2
drivers/media/cec/platform/cros-ec/cros-ec-cec.c
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@ -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; uint8_t *cec_message = cros_ec->event_data.data.cec_message;
unsigned int len = cros_ec->event_size; 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; cros_ec_cec->rx_msg.len = len;
memcpy(cros_ec_cec->rx_msg.msg, cec_message, len); memcpy(cros_ec_cec->rx_msg.msg, cec_message, len);