@@ -650,7 +650,6 @@ static void pulse8_disconnect(struct serio *serio)
struct pulse8 *pulse8 = serio_get_drvdata(serio);
cec_unregister_adapter(pulse8->adap);
- pulse8->serio = NULL;
serio_set_drvdata(serio, NULL);
serio_close(serio);
}
@@ -830,8 +829,10 @@ static int pulse8_connect(struct serio *serio, struct serio_driver *drv)
pulse8->adap = cec_allocate_adapter(&pulse8_cec_adap_ops, pulse8,
dev_name(&serio->dev), caps, 1);
err = PTR_ERR_OR_ZERO(pulse8->adap);
- if (err < 0)
- goto free_device;
+ if (err < 0) {
+ kfree(pulse8);
+ return err;
+ }
pulse8->dev = &serio->dev;
serio_set_drvdata(serio, pulse8);
@@ -874,8 +875,6 @@ static int pulse8_connect(struct serio *serio, struct serio_driver *drv)
serio_close(serio);
delete_adap:
cec_delete_adapter(pulse8->adap);
-free_device:
- kfree(pulse8);
return err;
}
Commit 601282d65b96b ("media: pulse8-cec: use adap_free callback") used the adap_free callback to clean up on disconnect. What I forgot was that in the probe it will call cec_delete_adapter() followed by kfree(pulse8) if an error occurs. But by using the adap_free callback, cec_delete_adapter() is already freeing the pulse8 struct. This wasn't noticed since normally the probe works fine, but Pulse-Eight published a new firmware version that caused a probe error, so now it hits this bug. This affects firmware version 12, but probably any version >= 10. Commit aa9eda76129ca ("media: pulse8-cec: close serio in disconnect, not adap_free") made this worse by adding the line 'pulse8->serio = NULL' right after the call to cec_unregister_adapter in the disconnect() function. Unfortunately, cec_unregister_adapter will typically call cec_delete_adapter (unless a filehandle to the cec device is still open), which frees the pulse8 struct. So now it will also crash on a simple unplug of the Pulse-Eight device. With this fix both the unplug issue and a probe() error situation are handled correctly again. It will still fail to probe() with a v12 firmware, that's something to look at separately. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Reported-by: Maxime Ripard <maxime@cerno.tech> Fixes: aa9eda76129ca ("media: pulse8-cec: close serio in disconnect, not adap_free") Fixes: 601282d65b96b ("media: pulse8-cec: use adap_free callback") --- drivers/media/cec/usb/pulse8/pulse8-cec.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)