linux-kernel - Re: [PATCH] exofs: check for allocation failure in uri

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Date:	Sun, 12 Aug 2012 21:57:28 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Sachin Bhamare <sbhamare@...asas.com>
CC:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Benny Halevy <bhalevy@...ian.com>, <osd-dev@...n-osd.org>,
	<linux-kernel@...r.kernel.org>, <ldv-project@...ras.ru>
Subject: Re: [PATCH] exofs: check for allocation failure in uri_store()

On 08/09/2012 09:54 PM, Sachin Bhamare wrote:

> On 8/8/12 10:02 AM, Alexey Khoroshilov wrote:
>> There is no memory allocation failure check in uri_store().
>> That can lead to NULL pointer dereference.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
>> ---
>>  fs/exofs/sys.c |    7 ++++++-
>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/exofs/sys.c b/fs/exofs/sys.c
>> index 5a7b691..1b4f2f9 100644
>> --- a/fs/exofs/sys.c
>> +++ b/fs/exofs/sys.c
>> @@ -80,8 +80,13 @@ static ssize_t uri_show(struct exofs_dev *edp, char *buf)
>>  
>>  static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
>>  {
>> +	uint8_t *new_uri;
>> +
>>  	edp->urilen = strlen(buf) + 1;
>> -	edp->uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
>> +	new_uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
>> +	if (new_uri == NULL)
>> +		return -ENOMEM;
>> +	edp->uri = new_uri;
>>  	strncpy(edp->uri, buf, edp->urilen);
>>  	return edp->urilen;
>>  }
> Ack-by : Sachin Bhamare <sbhamare@...asas.com>


Has been pushed to linux-next will be included in the next RCX
push to Linus.

Thanks
Boaz
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