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From: Rik van Riel on 20 Apr 2010 16:50
On 04/20/2010 03:24 PM, Oleg Nesterov wrote:
> If find_mergeable_anon_vma() succeeds but another thread installs
> ->anon_vma before we take ptl, then allocated == NULL but avc should
> be freed. Change the code to check avc != NULL to detect this case.

Good catch!

> Signed-off-by: Oleg Nesterov<oleg(a)redhat.com>

Reviewed-by: Rik van Riel <riel(a)redhat.com>
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