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 12:34:32 +0100
From:	Richard Weinberger <richard@....at>
To:	Tanya Brokhman <tlinder@...eaurora.org>, 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

Am 07.12.2014 um 12:32 schrieb Tanya Brokhman:
> 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 :)

No. fm_buf is vfree()d upon detach time.

Thanks,
//richard
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