Subject: Re: [PATCH] bus: fsl-mc: fix an error handling in fsl_mc_device_add()

From: Dan Carpenter <[email-masked]>
Date: Wed, 24 Dec 2025 10:54:38 +0300

On Tue, Dec 23, 2025 at 04:34:44PM +0100, Christophe Leroy (CS GROUP) wrote:
> 
> 
> Le 22/12/2025 à 08:49, Haoxiang Li a écrit :
> > If device_add() fails, call put_device() to drop the device
> > reference and do the cleanp.
> > 
> > Reported-by: Dan Carpenter <[email-masked]>
> > Closes: https://lore.kernel.org/all/[email-masked]/
> > Signed-off-by: Su Hui <[email-masked]>
> > Signed-off-by: Haoxiang Li <[email-masked]>
> > ---
> >   drivers/bus/fsl-mc/fsl-mc-bus.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> > index 25845c04e562..90a2107a9905 100644
> > --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> > +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> > @@ -896,7 +896,8 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
> >   		dev_err(parent_dev,
> >   			"device_add() failed for device %s: %d\n",
> >   			dev_name(&mc_dev->dev), error);
> > -		goto error_cleanup_dev;
> > +		put_device(&mc_dev->dev)
> 
> This change has obviously not been tested, not even built.
> 

Yeah, it doesn't build.

> And by droping the goto, the kfree() are not done anymore, leaking
> mc_bus/mc_dev p kzalloced areas.
> 

Calling put_device() triggers fsl_mc_device_release() which does the
free.

regards,
dan carpenter

> > +		return error;
> >   	}
> >   	dev_dbg(parent_dev, "added %s\n", dev_name(&mc_dev->dev));