[PATCH] __kmalloc: Generate BUG if size requested is too large.
I had an issue on ia64 where I got a bug in kernel/workqueue because
kzalloc returned a NULL pointer due to the task structure getting too big
for the slab allocator. Usually these cases are caught by the kmalloc
macro in include/linux/slab.h.
Compilation will fail if a too big value is passed to kmalloc.
However, kzalloc uses __kmalloc which has no check for that. This patch
makes __kmalloc bug if a too large entity is requested.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/slab.c b/mm/slab.c
index c9adfce..ad113c4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2907,8 +2907,7 @@
* functions.
*/
cachep = __find_general_cachep(size, flags);
- if (unlikely(cachep == NULL))
- return NULL;
+ BUG_ON(!cachep); /* Allocation size too large for kmalloc */
return __cache_alloc(cachep, flags);
}
EXPORT_SYMBOL(__kmalloc);