linux-kernel - Re: [PATCH 4/5] mempolicy: fix refcount leak in mpol_set_shared

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Message-ID: <00000139459223d7-93a9c53f-6724-4a4b-b675-cd25d8d53c71-000000@email.amazonses.com>
Date:	Mon, 20 Aug 2012 19:46:09 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Mel Gorman <mgorman@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Dave Jones <davej@...hat.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Andi Kleen <ak@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 4/5] mempolicy: fix refcount leak in
 mpol_set_shared_policy()

On Mon, 20 Aug 2012, Mel Gorman wrote:

> @@ -2318,9 +2323,7 @@ void mpol_free_shared_policy(struct shared_policy *p)
>  	while (next) {
>  		n = rb_entry(next, struct sp_node, nd);
>  		next = rb_next(&n->nd);
> -		rb_erase(&n->nd, &p->root);

Looks like we need to keep the above line? sp_delete does not remove the
tree entry.

> -		mpol_put(n->policy);
> -		kmem_cache_free(sn_cache, n);
> +		sp_delete(p, n);
>  	}
>  	mutex_unlock(&p->mutex);
>  }
>
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