Re: [bugfix] try_to_unmap_cluster() passes out-of-bounds pte topte_unmap()

[Andrew Morton]

William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:
>
> try_to_unmap_cluster() does:
>          for (pte = pte_offset_map(pmd, address);
>                          address < end; pte++, address += PAGE_SIZE) {
>  		...
>  	}
> 
>  	pte_unmap(pte);
> 
>  It may take a little staring to notice, but pte can actually fall off
>  the end of the pte page in this iteration,

That's about the third place we've had this bug.  Whoever keeps adding it
really should stop.

Thanks.
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