From 6286ae97d10ea2b5cd90532163797ab217bfdbdf Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Fri, 3 May 2013 15:43:18 +0000 Subject: 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 Signed-off-by: Christoph Lameter 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 --- include/linux/slab_def.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include') diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h index 113ec080313f..cd401580bdd3 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 -- cgit v1.2.3