Re: [PATCH] hugetlb: fix resv_map leak in error path

[KOSAKI Motohiro]

On 5/21/2012 4:28 PM, Dave Hansen wrote:
> When called for anonymous (non-shared) mappings,
> hugetlb_reserve_pages() does a resv_map_alloc().  It depends on
> code in hugetlbfs's vm_ops->close() to release that allocation.
> 
> However, in the mmap() failure path, we do a plain unmap_region()
> without the remove_vma() which actually calls vm_ops->close().
> 
> This is a decent fix.  This leak could get reintroduced if
> new code (say, after hugetlb_reserve_pages() in
> hugetlbfs_file_mmap()) decides to return an error.  But, I think
> it would have to unroll the reservation anyway.
> 
> This hasn't been extensively tested.  Pretty much compile and
> boot tested along with Christoph's test case:
> 
> 	http://marc.info/?l=linux-mm&m=133728900729735
> 
> Signed-off-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
> Acked-by: Mel Gorman <mel@xxxxxxxxx>
> ecked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>

typo. ;-)

> Reported/tested-by: Christoph Lameter <cl@xxxxxxxxx>

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