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

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Date:	Thu, 04 Dec 2014 13:00:15 +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 02/35] UBI: Fix stale pointers in ubi->lookuptbl

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.


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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