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authorChristoph Lameter <clameter@sgi.com>2007-10-16 01:24:46 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:53 -0700
commitef8b4520bd9f8294ffce9abd6158085bde5dc902 (patch)
treec099a16691ac06208f4d3d65b71e7adaf7361fcd /mm/slob.c
parent0da7e01f5f37f441cccd7c8c0586e06db0981907 (diff)
downloadlinux-ef8b4520bd9f8294ffce9abd6158085bde5dc902.tar.bz2
Slab allocators: fail if ksize is called with a NULL parameter
A NULL pointer means that the object was not allocated. One cannot determine the size of an object that has not been allocated. Currently we return 0 but we really should BUG() on attempts to determine the size of something nonexistent. krealloc() interprets NULL to mean a zero sized object. Handle that separately in krealloc(). Signed-off-by: Christoph Lameter <clameter@sgi.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slob.c')
-rw-r--r--mm/slob.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/slob.c b/mm/slob.c
index a886e83e17ef..de5d5563a46c 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -484,7 +484,8 @@ size_t ksize(const void *block)
{
struct slob_page *sp;
- if (unlikely(ZERO_OR_NULL_PTR(block)))
+ BUG_ON(!block);
+ if (unlikely(block == ZERO_SIZE_PTR))
return 0;
sp = (struct slob_page *)virt_to_page(block);