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authorChristoph Lameter <cl@linux.com>2013-05-03 15:43:18 (GMT)
committerPekka Enberg <penberg@kernel.org>2013-05-06 06:24:16 (GMT)
commit6286ae97d10ea2b5cd90532163797ab217bfdbdf (patch)
tree0724efb47d735ce835709d2402de02de4dd61f07 /mm/slab_common.c
parent14e50c6a9bc2b283bb4021026226268312ceefdd (diff)
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slab: Return NULL for oversized allocations
The inline path seems to have changed the SLAB behavior for very large kmalloc allocations with commit e3366016 ("slab: Use common kmalloc_index/kmalloc_size functions"). This patch restores the old behavior but also adds diagnostics so that we can figure where in the code these large allocations occur. Reported-and-tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Christoph Lameter <cl@linux.com> Link: http://lkml.kernel.org/r/201305040348.CIF81716.OStQOHFJMFLOVF@I-love.SAKURA.ne.jp [ penberg@kernel.org: use WARN_ON_ONCE ] Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 2f0e7d5..c5d352e 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -373,6 +373,9 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
{
int index;
+ if (WARN_ON_ONCE(size > KMALLOC_MAX_SIZE))
+ return NULL;
+
if (size <= 192) {
if (!size)
return ZERO_SIZE_PTR;