linux-kernel - Re: [PATCH RESEND 1/2] mtd: bcm47: convert kzalloc to avoid invalid access

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Date:	Thu, 30 May 2013 13:26:11 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Libo Chen <clbchenlibo.chen@...wei.com>
Cc:	dwmw2@...radead.org,
	Rafał Miłecki <zajec5@...il.com>,
	artem.bityutskiy@...ux.intel.com,
	Bill Pemberton <wfp5p@...ginia.edu>, hauke@...ke-m.de,
	linux-mtd@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH RESEND 1/2] mtd: bcm47: convert kzalloc to avoid invalid access

On Thu, May 30, 2013 at 5:22 AM, Libo Chen <clbchenlibo.chen@...wei.com> wrote:
> mtd is just member of bcm47xxsflash, so we should free bcm47xxsflash not its member.
> So I use devm_kazlloc instead of kazlloc to avoid it.

You may amend commit message, but technically you have my
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c
> index 18e7761..2630d5c 100644
> --- a/drivers/mtd/devices/bcm47xxsflash.c
> +++ b/drivers/mtd/devices/bcm47xxsflash.c
> @@ -54,11 +54,9 @@ static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
>         struct bcm47xxsflash *b47s;
>         int err;
>
> -       b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
> -       if (!b47s) {
> -               err = -ENOMEM;
> -               goto out;
> -       }
> +       b47s = devm_kzalloc(&pdev->dev, sizeof(*b47s), GFP_KERNEL);
> +       if (!b47s)
> +               return -ENOMEM;
>         sflash->priv = b47s;
>
>         b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
> @@ -81,15 +79,10 @@ static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
>         err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
>         if (err) {
>                 pr_err("Failed to register MTD device: %d\n", err);
> -               goto err_dev_reg;
> +               return err;
>         }
>
>         return 0;
> -
> -err_dev_reg:
> -       kfree(&b47s->mtd);
> -out:
> -       return err;
>  }
>
>  static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
> @@ -98,7 +91,6 @@ static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
>         struct bcm47xxsflash *b47s = sflash->priv;
>
>         mtd_device_unregister(&b47s->mtd);
> -       kfree(b47s);
>
>         return 0;
>  }
> --
> 1.7.1
>
>



--
With Best Regards,
Andy Shevchenko
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