linux-kernel - Re: [PATCH 1/6] UBI: Fastmap: Fix memory leaks while closing the WL sub-system

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Date:	Sun, 07 Dec 2014 13:32:50 +0200
From:	Tanya Brokhman <tlinder@...eaurora.org>
To:	Richard Weinberger <richard@....at>, dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] UBI: Fastmap: Fix memory leaks while closing the
 WL sub-system

On 12/7/2014 11:54 AM, Richard Weinberger wrote:
> Am 07.12.2014 um 09:13 schrieb Tanya Brokhman:
>> On 11/30/2014 1:35 PM, Richard Weinberger wrote:
>>> Add a ubi_fastmap_close() to free all resources used by fastmap
>>> at WL shutdown.
>>>
>>> Signed-off-by: Richard Weinberger <richard@....at>
>>> ---
>>>    drivers/mtd/ubi/wl.c | 21 ++++++++++++++++++---
>>>    1 file changed, 18 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
>>> index c2822f7..47b215f 100644
>>> --- a/drivers/mtd/ubi/wl.c
>>> +++ b/drivers/mtd/ubi/wl.c
>>> @@ -2064,6 +2064,23 @@ static void protection_queue_destroy(struct ubi_device *ubi)
>>>        }
>>>    }
>>>
>>> +static void ubi_fastmap_close(struct ubi_device *ubi)
>>> +{
>>> +#ifdef CONFIG_MTD_UBI_FASTMAP
>>> +    int i;
>>> +
>>> +    flush_work(&ubi->fm_work);
>>> +    return_unused_pool_pebs(ubi, &ubi->fm_pool);
>>> +    return_unused_pool_pebs(ubi, &ubi->fm_wl_pool);
>>> +
>>> +    if (ubi->fm) {
>>> +        for (i = 0; i < ubi->fm->used_blocks; i++)
>>> +            kfree(ubi->fm->e[i]);
>>> +    }
>>> +    kfree(ubi->fm);
>>
>> kfree(ubi->fm_buf)?
>
> No this is not a typo, I kfree() here ubi->fm by design.
> What am I missing? :)

I think you missed freeing ubi->fm_buf, before (not instead) you free 
ubi->fm :)

>
> Thanks,
> //richard
>


Thanks,
Tanya Brokhman
-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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