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

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Date:   Fri, 4 Oct 2019 17:57:40 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Navid Emamdoost <navid.emamdoost@...il.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>, kjlu@....edu,
        Stephen McCamant <smccaman@....edu>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: onenand: prevent memory leak in onenand_scan

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