This is a note to let you know that I've just added the patch titled
media: cec: core: add adap_nb_transmit_canceled() callback
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-cec-core-add-adap_nb_transmit_canceled-callbac.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 382467e0656b22d202965b76dd72b49ff237b67b
Author: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Date: Mon Jun 12 15:58:37 2023 +0200
media: cec: core: add adap_nb_transmit_canceled() callback
[ Upstream commit da53c36ddd3f118a525a04faa8c47ca471e6c467 ]
A potential deadlock was found by Zheng Zhang with a local syzkaller
instance.
The problem is that when a non-blocking CEC transmit is canceled by calling
cec_data_cancel, that in turn can call the high-level received() driver
callback, which can call cec_transmit_msg() to transmit a new message.
The cec_data_cancel() function is called with the adap->lock mutex held,
and cec_transmit_msg() tries to take that same lock.
The root cause is that the received() callback can either be used to pass
on a received message (and then adap->lock is not held), or to report a
canceled transmit (and then adap->lock is held).
This is confusing, so create a new low-level adap_nb_transmit_canceled
callback that reports back that a non-blocking transmit was canceled.
And the received() callback is only called when a message is received,
as was the case before commit f9d0ecbf56f4 ("media: cec: correctly pass
on reply results") complicated matters.
Reported-by: Zheng Zhang <zheng.zhang@xxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Fixes: f9d0ecbf56f4 ("media: cec: correctly pass on reply results")
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c
index bf5386d0f5858..1f8ac656aede1 100644
--- a/drivers/media/cec/core/cec-adap.c
+++ b/drivers/media/cec/core/cec-adap.c
@@ -397,8 +397,8 @@ static void cec_data_cancel(struct cec_data *data, u8 tx_status, u8 rx_status)
cec_queue_msg_monitor(adap, &data->msg, 1);
if (!data->blocking && data->msg.sequence)
- /* Allow drivers to process the message first */
- call_op(adap, received, &data->msg);
+ /* Allow drivers to react to a canceled transmit */
+ call_void_op(adap, adap_nb_transmit_canceled, &data->msg);
cec_data_completed(data);
}
diff --git a/include/media/cec.h b/include/media/cec.h
index 23202bf439b47..38eb9334d854f 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -120,14 +120,16 @@ struct cec_adap_ops {
int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
u32 signal_free_time, struct cec_msg *msg);
+ void (*adap_nb_transmit_canceled)(struct cec_adapter *adap,
+ const struct cec_msg *msg);
void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
void (*adap_free)(struct cec_adapter *adap);
- /* Error injection callbacks */
+ /* Error injection callbacks, called without adap->lock held */
int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);
- /* High-level CEC message callback */
+ /* High-level CEC message callback, called without adap->lock held */
int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
};
