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

[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.


Thanks,
Tanya Brokhman
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