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From:   Andrey Konovalov <andreyknvl@google.com>
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        Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v13 02/25] kasan, slub: handle pointer tags in early_kmem_cache_node_alloc
Date:   Thu,  6 Dec 2018 13:24:20 +0100
Message-Id: <fc8d0fdcf733a7a52e8d0daaa650f4736a57de8c.1544099024.git.andreyknvl@google.com>
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The previous patch updated KASAN hooks signatures and their usage in SLAB
and SLUB code, except for the early_kmem_cache_node_alloc function. This
patch handles that function separately, as it requires to reorder some of
the initialization code to correctly propagate a tagged pointer in case a
tag is assigned by kasan_kmalloc.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 mm/slub.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index fdd4a86aa882..8561a32910dd 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3364,16 +3364,16 @@ static void early_kmem_cache_node_alloc(int node)
 
 	n = page->freelist;
 	BUG_ON(!n);
-	page->freelist = get_freepointer(kmem_cache_node, n);
-	page->inuse = 1;
-	page->frozen = 0;
-	kmem_cache_node->node[node] = n;
 #ifdef CONFIG_SLUB_DEBUG
 	init_object(kmem_cache_node, n, SLUB_RED_ACTIVE);
 	init_tracking(kmem_cache_node, n);
 #endif
-	kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node),
+	n = kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node),
 		      GFP_KERNEL);
+	page->freelist = get_freepointer(kmem_cache_node, n);
+	page->inuse = 1;
+	page->frozen = 0;
+	kmem_cache_node->node[node] = n;
 	init_kmem_cache_node(n);
 	inc_slabs_node(kmem_cache_node, node, page->objects);
 
-- 
2.20.0.rc1.387.gf8505762e3-goog