Commit eafb4270 authored Sep 22, 2005 by Christoph Lameter Committed by Linus Torvalds Sep 22, 2005

[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>

parent 0cdc82ee

mm/slab.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -2907,8 +2907,7 @@ void *__kmalloc(size_t size, unsigned int __nocast flags)
		* 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);