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authorDavid Rientjes <rientjes@google.com>2009-01-27 18:59:46 -0800
committerPekka Enberg <penberg@cs.helsinki.fi>2009-01-28 10:43:42 +0200
commit3718909448116bf4411445468c58acc946379f92 (patch)
tree77d34de16274c12fb2bdcc946379a1c667f5671c
parenta6525042bfdfcab128bd91fad264de10fd24a55e (diff)
downloadlinux-3718909448116bf4411445468c58acc946379f92.tar.gz
slub: fix per cpu kmem_cache_cpu array memory leak
The per cpu array of kmem_cache_cpu structures accomodates NR_KMEM_CACHE_CPU such structs. When this array overflows and a struct is allocated by kmalloc(), it may have an address at the upper bound of this array. If this happens, it does not get freed and the per cpu kmem_cache_cpu_free pointer will be out of bounds after kmem_cache_destroy() or cpu offlining. Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
-rw-r--r--mm/slub.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 6392ae5cc6b..bdc9abb08a2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1996,7 +1996,7 @@ static struct kmem_cache_cpu *alloc_kmem_cache_cpu(struct kmem_cache *s,
static void free_kmem_cache_cpu(struct kmem_cache_cpu *c, int cpu)
{
if (c < per_cpu(kmem_cache_cpu, cpu) ||
- c > per_cpu(kmem_cache_cpu, cpu) + NR_KMEM_CACHE_CPU) {
+ c >= per_cpu(kmem_cache_cpu, cpu) + NR_KMEM_CACHE_CPU) {
kfree(c);
return;
}