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

[ Upstream commit 9389d38f871fc6f94caab479862a1aecbbc9f7ed ]

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>

diff --git a/drivers/media/platform/cros-ec-cec/cros-ec-cec.c b/drivers/media/platform/cros-ec-cec/cros-ec-cec.c
index 31390ce2dbf2d4f3c1243ac1f8181d5e310da720..ae274a7aa3a94884c59f564e458458a32d4ce182 100644 (file)
--- a/drivers/media/platform/cros-ec-cec/cros-ec-cec.c
+++ b/drivers/media/platform/cros-ec-cec/cros-ec-cec.c
@@ -45,6 +45,8 @@ 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);