linux-kernel - [GIT PULL] SLUB/SLOB updates for 2.6.26

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Date:	Mon, 26 May 2008 18:39:18 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	torvalds@...ux-foundation.org
cc:	linux-kernel@...r.kernel.org, Christoph Lameter <clameter@....com>,
	Matt Mackall <mpm@...enic.com>,
	MinChan Kim <minchan.kim@...il.com>, akpm@...ux-foundation.org
Subject: [GIT PULL] SLUB/SLOB updates for 2.6.26

Hi Linus,

Please pull the latest SLAB git tree from:

  git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6.git for-linus

It has a fix for out-of-memory condition in SLOB and a new WARN_ON for SLUB to
detect ksize() abuse.

                Pekka

MinChan Kim (1):
      slob: Fix to return wrong pointer

Pekka Enberg (1):
      slub: ksize() abuse checks

 mm/slob.c |    5 +++--
 mm/slub.c |    5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/mm/slob.c b/mm/slob.c
index 6038cba..a3ad667 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -469,8 +469,9 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
 			return ZERO_SIZE_PTR;
 
 		m = slob_alloc(size + align, gfp, align, node);
-		if (m)
-			*m = size;
+		if (!m)
+			return NULL;
+		*m = size;
 		return (void *)m + align;
 	} else {
 		void *ret;
diff --git a/mm/slub.c b/mm/slub.c
index a505a82..0987d1c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2726,9 +2726,10 @@ size_t ksize(const void *object)
 
 	page = virt_to_head_page(object);
 
-	if (unlikely(!PageSlab(page)))
+	if (unlikely(!PageSlab(page))) {
+		WARN_ON(!PageCompound(page));
 		return PAGE_SIZE << compound_order(page);
-
+	}
 	s = page->slab;
 
 #ifdef CONFIG_SLUB_DEBUG
--
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