linux-kernel - Re: [patch 3/4] mempolicy: add MPOL_F_STATIC

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Date:	Mon, 11 Feb 2008 11:56:24 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Jackson <pj@....com>,
	Christoph Lameter <clameter@....com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/4] mempolicy: add MPOL_F_STATIC_NODES flag

On Tue, 12 Feb 2008, KOSAKI Motohiro wrote:

> > @@ -218,21 +167,27 @@ static struct mempolicy *mpol_new(enum mempolicy_mode mode,
> >                 return ERR_PTR(-ENOMEM);
> >         flags &= MPOL_MODE_FLAGS;
> >         atomic_set(&policy->refcnt, 1);
> > +       cpuset_update_task_memory_state();
> > +       nodes_and(cpuset_context_nmask, *nodes, cpuset_current_mems_allowed);
> >         switch (mode) {
> >         case MPOL_INTERLEAVE:
> > -               policy->v.nodes = *nodes;
> > +               if (nodes_empty(*nodes))
> > +                       return ERR_PTR(-EINVAL);
> 
> need kmem_cache_free(policy_cache, policy) before return?
> 

Very good catch!



mempolicy: fix policy memory leak in mpol_new()

If mpol_new() cannot setup a new mempolicy because of an invalid argument
provided by the user, avoid leaking the mempolicy that has been dynamically
allocated.

Reported by KOSAKI Motohiro.

Cc: Paul Jackson <pj@....com>
Cc: Christoph Lameter <clameter@....com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc: Andi Kleen <ak@...e.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/mempolicy.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -171,13 +171,11 @@ static struct mempolicy *mpol_new(enum mempolicy_mode mode,
 	nodes_and(cpuset_context_nmask, *nodes, cpuset_current_mems_allowed);
 	switch (mode) {
 	case MPOL_INTERLEAVE:
-		if (nodes_empty(*nodes))
-			return ERR_PTR(-EINVAL);
-		policy->v.nodes = cpuset_context_nmask;
-		if (nodes_weight(policy->v.nodes) == 0) {
+		if (nodes_empty(*nodes) || nodes_empty(cpuset_context_nmask)) {
 			kmem_cache_free(policy_cache, policy);
 			return ERR_PTR(-EINVAL);
 		}
+		policy->v.nodes = cpuset_context_nmask;
 		break;
 	case MPOL_PREFERRED:
 		policy->v.preferred_node = first_node(cpuset_context_nmask);
@@ -185,8 +183,10 @@ static struct mempolicy *mpol_new(enum mempolicy_mode mode,
 			policy->v.preferred_node = -1;
 		break;
 	case MPOL_BIND:
-		if (nodes_empty(*nodes))
+		if (nodes_empty(*nodes)) {
+			kmem_cache_free(policy_cache, policy);
 			return ERR_PTR(-EINVAL);
+		}
 		policy->v.zonelist = bind_zonelist(&cpuset_context_nmask);
 		if (IS_ERR(policy->v.zonelist)) {
 			void *error_code = policy->v.zonelist;
--
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