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[media] cec: sanitize msg.flags

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The CEC_MSG_FL_REPLY_TO_FOLLOWERS message flag only makes sense for transmitted
messages where you want to wait for the reply.

Clear the flag in all other cases.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2016-11-04 07:52:11 -02:00 committed by Mauro Carvalho Chehab
parent 0dbacebede
commit 7ae2a888ee
2 changed files with 5 additions and 1 deletions
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4
drivers/media/cec/cec-adap.c
View file

@ -595,6 +595,10 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
/* Make sure the timeout isn't 0. */
msg->timeout = 1000;
}
if (msg->timeout)
msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS;
else
msg->flags = 0;
/* Sanity checks */
if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) {

2
drivers/media/cec/cec-api.c
View file

@ -197,7 +197,6 @@ static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
(msg.len == 1 || msg.msg[1] != CEC_MSG_CDC_MESSAGE))
return -EINVAL;
msg.flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS;
mutex_lock(&adap->lock);
if (!adap->is_configured)
err = -ENONET;
@ -282,6 +281,7 @@ static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
err = cec_receive_msg(fh, &msg, block);
if (err)
return err;
msg.flags = 0;
if (copy_to_user(parg, &msg, sizeof(msg)))
return -EFAULT;
return 0;