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| author | Christoph Lameter <cl@linux.com> | 2013-05-03 15:43:18 +0000 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2013-05-06 09:24:16 +0300 |
| commit | 6286ae97d10ea2b5cd90532163797ab217bfdbdf (patch) | |
| tree | 0724efb47d735ce835709d2402de02de4dd61f07 | |
| parent | 14e50c6a9bc2b283bb4021026226268312ceefdd (diff) | |
| download | op-kernel-dev-6286ae97d10ea2b5cd90532163797ab217bfdbdf.zip op-kernel-dev-6286ae97d10ea2b5cd90532163797ab217bfdbdf.tar.gz | |
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>
| -rw-r--r-- | include/linux/slab_def.h | 6 | ||||
| -rw-r--r-- | mm/slab_common.c | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h index 113ec08..cd40158 100644 --- a/include/linux/slab_def.h +++ b/include/linux/slab_def.h @@ -126,6 +126,9 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags) if (!size) return ZERO_SIZE_PTR; + if (WARN_ON_ONCE(size > KMALLOC_MAX_SIZE)) + return NULL; + i = kmalloc_index(size); #ifdef CONFIG_ZONE_DMA @@ -172,6 +175,9 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) if (!size) return ZERO_SIZE_PTR; + if (WARN_ON_ONCE(size > KMALLOC_MAX_SIZE)) + return NULL; + i = kmalloc_index(size); #ifdef CONFIG_ZONE_DMA 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; |
