linux-kernel - [RFC] fix slub krealloc()

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Message-Id: <1184773331.4002.4.camel@johannes.berg>
Date:	Wed, 18 Jul 2007 17:42:11 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [RFC] fix slub krealloc()

Commit ef2ad80c7d255ed0449eda947c2d700635b7e0f5 breaks
krealloc(NULL, ...) badly, it BUG_ON()s.

This patch fixes it but the fix should probably be in mm/util.c because
the documentation says that krealloc(NULL, x, gfp) is equivalent to
kmalloc(x, gfp) and that's not true any more even after this patch when
you do krealloc(NULL, 0, gfp)

johannes

---
 mm/slub.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- wireless-dev.orig/mm/slub.c	2007-07-18 16:25:11.809440194 +0200
+++ wireless-dev/mm/slub.c	2007-07-18 16:25:22.809440194 +0200
@@ -2394,7 +2394,7 @@ size_t ksize(const void *object)
 	struct page *page;
 	struct kmem_cache *s;
 
-	if (object == ZERO_SIZE_PTR)
+	if (object == ZERO_SIZE_PTR || !object)
 		return 0;
 
 	page = get_object_page(object);


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