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

From: Richard Weinberger
Date: Thu Dec 04 2014 - 06:04:40 EST


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.

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