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| author | David Rientjes <rientjes@google.com> | 2009-01-27 18:59:46 -0800 |
|---|---|---|
| committer | Pekka Enberg <penberg@cs.helsinki.fi> | 2009-01-28 10:43:42 +0200 |
| commit | 3718909448116bf4411445468c58acc946379f92 (patch) | |
| tree | 77d34de16274c12fb2bdcc946379a1c667f5671c /mm/slub.c | |
| parent | a6525042bfdfcab128bd91fad264de10fd24a55e (diff) | |
| download | lwn-3718909448116bf4411445468c58acc946379f92.tar.gz lwn-3718909448116bf4411445468c58acc946379f92.zip | |
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>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slub.c b/mm/slub.c index 6392ae5cc6b1..bdc9abb08a23 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; } |