linux-kernel - [PATCH] kmemleak: Trace the kmalloc

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Date:	Fri, 03 Jul 2009 13:18:26 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: [PATCH] kmemleak: Trace the kmalloc_large* functions in slub

The kmalloc_large() and kmalloc_large_node() functions were missed when
adding the kmemleak hooks to the slub allocator. However, they should be
traced to avoid false positives.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Christoph Lameter <cl@...ux-foundation.org>
Cc: Pekka Enberg <penberg@...helsinki.fi>
---
 include/linux/slub_def.h |    2 ++
 mm/slub.c                |   10 ++++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 4dcbc2c..c1c862b 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -11,6 +11,7 @@
 #include <linux/workqueue.h>
 #include <linux/kobject.h>
 #include <linux/kmemtrace.h>
+#include <linux/kmemleak.h>
 
 enum stat_item {
 	ALLOC_FASTPATH,		/* Allocation from cpu slab */
@@ -233,6 +234,7 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
 	unsigned int order = get_order(size);
 	void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
 
+	kmemleak_alloc(ret, size, 1, flags);
 	trace_kmalloc(_THIS_IP_, ret, size, PAGE_SIZE << order, flags);
 
 	return ret;
diff --git a/mm/slub.c b/mm/slub.c
index 819f056..f8d6df8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -21,7 +21,6 @@
 #include <linux/kmemcheck.h>
 #include <linux/cpu.h>
 #include <linux/cpuset.h>
-#include <linux/kmemleak.h>
 #include <linux/mempolicy.h>
 #include <linux/ctype.h>
 #include <linux/debugobjects.h>
@@ -2833,13 +2832,15 @@ EXPORT_SYMBOL(__kmalloc);
 static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
 {
 	struct page *page;
+	void *ptr = NULL;
 
 	flags |= __GFP_COMP | __GFP_NOTRACK;
 	page = alloc_pages_node(node, flags, get_order(size));
 	if (page)
-		return page_address(page);
-	else
-		return NULL;
+		ptr = page_address(page);
+
+	kmemleak_alloc(ptr, size, 1, flags);
+	return ptr;
 }
 
 #ifdef CONFIG_NUMA
@@ -2924,6 +2925,7 @@ void kfree(const void *x)
 	page = virt_to_head_page(x);
 	if (unlikely(!PageSlab(page))) {
 		BUG_ON(!PageCompound(page));
+		kmemleak_free(x);
 		put_page(page);
 		return;
 	}

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