Re: [PATCH 02/35] UBI: Fix stale pointers in ubi->lookuptbl
From: Richard Weinberger
Date: Thu Dec 04 2014 - 07:40:15 EST
Am 04.12.2014 um 13:37 schrieb Tanya Brokhman:
> On 12/4/2014 1:04 PM, Richard Weinberger wrote:
>> 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.
> 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?
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