linux-kernel - Re: [PATCH] drivers/mmc/card/block.c: fix potential null dereference 'idata'

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Message-ID: <Pine.LNX.4.64.1105091811320.15483@pc-004.diku.dk>
Date:	Mon, 9 May 2011 18:12:05 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Vladimir Motyka <vladimir.motyka@...il.com>
Cc:	cjb@...top.org, kernel-janitors@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/mmc/card/block.c: fix potential null dereference
 'idata'

I guess there is also a point at which idata has been successfully 
allocated but idata->buf has not.

julia


On Mon, 9 May 2011, Vladimir Motyka wrote:

> When allocation of idata fails there was a null dereference.
> 
> Signed-off-by: Vladimir Motyka <vladimir.motyka@...il.com>
> ---
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 407836d..a03cdc6 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -237,7 +237,7 @@ static struct mmc_blk_ioc_data
> *mmc_blk_ioctl_copy_from_user(
>  	idata = kzalloc(sizeof(*idata), GFP_KERNEL);
>  	if (!idata) {
>  		err = -ENOMEM;
> -		goto copy_err;
> +		goto alloc_err;
>  	}
> 
>  	if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
> @@ -268,8 +268,8 @@ static struct mmc_blk_ioc_data
> *mmc_blk_ioctl_copy_from_user(
>  copy_err:
>  	kfree(idata->buf);
>  	kfree(idata);
> +alloc_err:
>  	return ERR_PTR(err);
> -
>  }
> 
>  static int mmc_blk_ioctl_cmd(struct block_device *bdev,
> --
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