linux-kernel - Re: [PATCH] mtd: onenand: prevent memory leak in onenand

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Message-ID: <CAEkB2ERissJF6EOhMtoO+RBXJOVnZYuMBnkvL2DxxMKfVJoYXQ@mail.gmail.com>
Date:   Fri, 4 Oct 2019 12:20:20 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Navid Emamdoost <emamd001@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>,
        linux-mtd@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: onenand: prevent memory leak in onenand_scan

Thanks Miquel for pointing that out. v2 was sent.

Thank you,
Navid.

On Fri, Oct 4, 2019 at 10:57 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> Hi Navid,
>
> Navid Emamdoost <navid.emamdoost@...il.com> wrote on Mon, 30 Sep 2019
> 16:37:17 -0500:
>
> > Would you please take a look at this patch?
> >
> > On Wed, Sep 25, 2019 at 10:43 AM Navid Emamdoost
> > <navid.emamdoost@...il.com> wrote:
> > >
> > > In onenand_scan if scan_bbt fails the allocated buffers should be
> > > released.
> > >
> > > Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> > > ---
> > >  drivers/mtd/nand/onenand/onenand_base.c | 5 ++++-
> > >  1 file changed, 4 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c
> > > index 77bd32a683e1..79c01f42925a 100644
> > > --- a/drivers/mtd/nand/onenand/onenand_base.c
> > > +++ b/drivers/mtd/nand/onenand/onenand_base.c
> > > @@ -3977,8 +3977,11 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
> > >         this->badblockpos = ONENAND_BADBLOCK_POS;
> > >
> > >         ret = this->scan_bbt(mtd);
> > > -       if ((!FLEXONENAND(this)) || ret)
> > > +       if ((!FLEXONENAND(this)) || ret) {
> > > +               kfree(this->page_buf);
>
> Apparently you missed:
>
> #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
>         kfree(this->verify_buf);
> #endif
>
> > > +               kfree(this->oob_buf);
> > >                 return ret;
> > > +       }
> > >
> > >         /* Change Flex-OneNAND boundaries if required */
> > >         for (i = 0; i < MAX_DIES; i++)
> > > --
> > > 2.17.1
> > >
> >
> >
>
> Thanks,
> Miquèl



-- 
Navid.