linux-kernel - Re: [PATCH][next][V2] tee: fix memory allocation failure checks on drv

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Date:   Fri, 17 Jan 2020 13:16:03 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     "Thomas, Rijo-john" <Rijo-john.Thomas@....com>
Cc:     Colin King <colin.king@...onical.com>,
        Devaraj Rangasamy <Devaraj.Rangasamy@....com>,
        Gary R Hook <gary.hook@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next][V2] tee: fix memory allocation failure checks on
 drv_data and amdtee

On Fri, Jan 17, 2020 at 7:40 AM Thomas, Rijo-john
<Rijo-john.Thomas@....com> wrote:
>
>
>
> On 16/01/20 9:18 pm, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > Currently the memory allocation failure checks on drv_data and
> > amdtee are using IS_ERR rather than checking for a null pointer.
> > Fix these checks to use the conventional null pointer check.
> >
> > Addresses-Coverity: ("Dereference null return")
> > Fixes: 757cc3e9ff1d ("tee: add AMD-TEE driver")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
>
> Reviewed-by: Rijo Thomas <Rijo-john.Thomas@....com>

Acked-by: Jens Wiklander <jens.wiklander@...aro.org>

Thanks,
Jens

>
> Thanks,
> Rijo
>
> > ---
> > V2: update to apply against cryptodev-2.6 tree tip
> > ---
> >  drivers/tee/amdtee/core.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/tee/amdtee/core.c b/drivers/tee/amdtee/core.c
> > index be8937eb5d43..6370bb55f512 100644
> > --- a/drivers/tee/amdtee/core.c
> > +++ b/drivers/tee/amdtee/core.c
> > @@ -446,11 +446,11 @@ static int __init amdtee_driver_init(void)
> >       }
> >
> >       drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
> > -     if (IS_ERR(drv_data))
> > +     if (!drv_data)
> >               return -ENOMEM;
> >
> >       amdtee = kzalloc(sizeof(*amdtee), GFP_KERNEL);
> > -     if (IS_ERR(amdtee)) {
> > +     if (!amdtee) {
> >               rc = -ENOMEM;
> >               goto err_kfree_drv_data;
> >       }
> >