linux-kernel - Re: [PATCH 02/35] UBI: Fix stale pointers in ubi->lookuptbl

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Message-ID: <54805626.7030709@nod.at>
Date:	Thu, 04 Dec 2014 13:40:06 +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 02/35] UBI: Fix stale pointers in ubi->lookuptbl

Am 04.12.2014 um 13:37 schrieb Tanya Brokhman:
> On 12/4/2014 1:04 PM, Richard Weinberger wrote:
>> Tanya,
>>
>> Am 04.12.2014 um 12:00 schrieb Tanya Brokhman:
>>> Hi Richard
>>>
>>> On 10/29/2014 2:45 PM, Richard Weinberger wrote:
>>>> In some error paths the WL sub-system gives up on a PEB
>>>> and frees it's ubi_wl_entry struct but does not set
>>>> the entry in ubi->lookuptbl to NULL.
>>>> Fastmap can stumble over such a stale pointer as it uses
>>>> ubi->lookuptbl to find all PEBs.
>>>>
>>>> Fix this by setting the pointers to free'd ubi_wl_entry to NULL.
>>>
>>> There are 2 more places:
>>> tree_destroy() and protection_queue_destroy() where ubi_wl_entry is released. Both functions used on power down so all should be good as is, just wanted to make sure you didn't add
>>> ubi->lookuptbl[e2->pnum] = NULL there on purpose.
>>
>> I fear you're looking at the old patch series.
>> Please have a look at:
>> "[PATCH 3/6] UBI: Fix stale pointers in ubi->lookuptbl" sent on 30.11.2014.
>>
>> Thanks,
>> //richard
>>
> 
> oh, you're right. Started from the oldest. now I see you released v2. Sorry. So I should be looking at "Fastmap update v2 (pile 1-7)", right?

Correct. :)

Thanks,
//richard
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