From 54e670386ee302cd17d17ac398d1e718307633f2 Mon Sep 17 00:00:00 2001 From: KOSAKI Motohiro Date: Mon, 8 Oct 2012 16:29:19 -0700 Subject: mempolicy: fix refcount leak in mpol_set_shared_policy() commit 63f74ca21f1fad36d075e063f06dcc6d39fe86b2 upstream. When shared_policy_replace() fails to allocate new->policy is not freed correctly by mpol_set_shared_policy(). The problem is that shared mempolicy code directly call kmem_cache_free() in multiple places where it is easy to make a mistake. This patch creates an sp_free wrapper function and uses it. The bug was introduced pre-git age (IOW, before 2.6.12-rc2). [mgorman@suse.de: Editted changelog] Signed-off-by: KOSAKI Motohiro Signed-off-by: Mel Gorman Reviewed-by: Christoph Lameter Cc: Josh Boyer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Mel Gorman Signed-off-by: Ben Hutchings --- mm/mempolicy.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'mm') diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 2ac1b38e97d..0c13a1b74ab 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2121,12 +2121,17 @@ mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) return pol; } +static void sp_free(struct sp_node *n) +{ + mpol_put(n->policy); + kmem_cache_free(sn_cache, n); +} + static void sp_delete(struct shared_policy *sp, struct sp_node *n) { pr_debug("deleting %lx-l%lx\n", n->start, n->end); rb_erase(&n->nd, &sp->root); - mpol_put(n->policy); - kmem_cache_free(sn_cache, n); + sp_free(n); } static struct sp_node *sp_alloc(unsigned long start, unsigned long end, @@ -2265,7 +2270,7 @@ int mpol_set_shared_policy(struct shared_policy *info, } err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); if (err && new) - kmem_cache_free(sn_cache, new); + sp_free(new); return err; } @@ -2282,9 +2287,7 @@ 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); - mpol_put(n->policy); - kmem_cache_free(sn_cache, n); + sp_delete(p, n); } mutex_unlock(&p->mutex); } -- cgit v1.2.3-18-g5258