Re: [PATCH v2] mm: rmap: fix use-after-free in __put_anon_vma

[David Rientjes]

On Fri, 6 Jun 2014, Andrey Ryabinin wrote:

> While working address sanitizer for kernel I've discovered use-after-free
> bug in __put_anon_vma.
> For the last anon_vma, anon_vma->root freed before child anon_vma.
> Later in anon_vma_free(anon_vma) we are referencing to already freed anon_vma->root
> to check rwsem.
> This patch puts freeing of child anon_vma before freeing of anon_vma->root.
> 
> Cc: <stable@xxxxxxxxxxxxxxx> # v3.0+
> Signed-off-by: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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