Em Thu, 25 Sep 2014 17:37:46 +0200
Julia Lawall <julia.law...@lip6.fr> escreveu:
> On Thu, 25 Sep 2014, Frank Schäfer wrote:
>
> > Hi Dan,
> >
> > Am 25.09.2014 um 13:39 schrieb Dan Carpenter:
> > > We call "kfree(ir->i2c_client);" in the error handling and that doesn't
> > > work if "ir" is NULL.
> > >
> > > Fixes: 78e719a5f30b ('[media] em28xx-input: i2c IR decoders: improve
> > > i2c_client handling')
> > > Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
> > >
> > > diff --git a/drivers/media/usb/em28xx/em28xx-input.c
> > > b/drivers/media/usb/em28xx/em28xx-input.c
> > > index 581f6da..23f8f6a 100644
> > > --- a/drivers/media/usb/em28xx/em28xx-input.c
> > > +++ b/drivers/media/usb/em28xx/em28xx-input.c
> > > @@ -712,8 +712,10 @@ static int em28xx_ir_init(struct em28xx *dev)
> > > em28xx_info("Registering input extension\n");
> > >
> > > ir = kzalloc(sizeof(*ir), GFP_KERNEL);
> > > + if (!ir)
> > > + return -ENOMEM;
> > > rc = rc_allocate_device();
> > > - if (!ir || !rc)
> > > + if (!rc)
> > > goto error;
>
> I have never understood this kind of code. If the kmalloc fails, why not
> give up immediately (as in Dan's patch)?
I agree. In this specific place, it can just return an error, as there's
nothing yet used, just like the previous clauses.
Regards,
Mauro
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