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

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Date:	Mon, 09 May 2011 22:37:21 +0200
From:	Vladimir Motyka <vladimir.motyka@...il.com>
To:	Julia Lawall <julia@...u.dk>
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'

On 05/09/2011 06:12 PM, Julia Lawall wrote:
> I guess there is also a point at which idata has been successfully 
> allocated but idata->buf has not.
> 
> julia
> 
Yes there is. Thank You for pointing out.

Vladimir Motyka

> 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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