Re: [PATCH v3 2/2] iio: gyro: mpu3050: add missing trigger cleanup on remove()

[Joshua Crofts]

On Mon, 19 Oct 2026 11:54:41 +0100
Nuno Sá <nuno.sa@xxxxxxxxxx> wrote:

> On Sat, Oct 17, 2026 at 07:19:21AM +0200, Joshua Crofts wrote:
> > The mpu3050_trigger_probe() registers a trigger but
> > mpu3050_common_remove() and error paths in mpu3050_common_probe() forget
> > to clean it up, causing a use-after-free bug.
> > 
> > Add the missing calls to the iio_trigger_unregister() function.
> > 
> > Reported-by: Dingisoul <dingiso.kernel@xxxxxxxxx>
> > Closes: https://lore.kernel.org/all/20261010203601.1686148-1-dingiso.kernel@xxxxxxxxx/
> > Fixes: 3904b28efb2c ("iio: gyro: Add driver for the MPU-3050 gyroscope")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Joshua Crofts <joshua.crofts1@xxxxxxxxx>
> > ---
> >  drivers/iio/gyro/mpu3050-core.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/gyro/mpu3050-core.c b/drivers/iio/gyro/mpu3050-core.c
> > index 879caf3b729c..9e747836df3e 100644
> > --- a/drivers/iio/gyro/mpu3050-core.c
> > +++ b/drivers/iio/gyro/mpu3050-core.c
> > @@ -1262,7 +1262,9 @@ int mpu3050_common_probe(struct device *dev,
> >  	pm_runtime_get_sync(dev);
> >  	pm_runtime_put_noidle(dev);
> >  	pm_runtime_disable(dev);
> > -	if (irq)
> > +	if (mpu3050->trig)
> > +		iio_trigger_unregister(mpu3050->trig);  
> 
> Yeah, I think sashiko is right... I think we can just reuse the if
> (mpu3050->irq) condition for unregistering  but then this patch depends
> on the previous one. And such dependencies can be set for stable so
> don't think it's an issue.
> 
> I already pointed it out and Jonathan seems to have said the same. If
> you do have the time, converting the whole thing to devm would be nice 
> - could be patch 3 :)

Bad time to be lazy :P I'll have a look.

-- 
Kind regards,
Joshua Crofts