linux-kernel - [PATCH 3/7] mm/slub.c: remove invalid reference to list iterator variable

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Date:	Sun,  8 Jul 2012 13:37:40 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kernel-janitors@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] mm/slub.c: remove invalid reference to list iterator variable

From: Julia Lawall <Julia.Lawall@...6.fr>

If list_for_each_entry, etc complete a traversal of the list, the iterator
variable ends up pointing to an address at an offset from the list head,
and not a meaningful structure.  Thus this value should not be used after
the end of the iterator.  The patch replaces s->name by al->name, which is
referenced nearby.

This problem was found using Coccinelle (http://coccinelle.lip6.fr/).

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

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

diff --git a/mm/slub.c b/mm/slub.c
index cc4ed03..ef9bf01 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5395,7 +5395,7 @@ static int __init slab_sysfs_init(void)
 		err = sysfs_slab_alias(al->s, al->name);
 		if (err)
 			printk(KERN_ERR "SLUB: Unable to add boot slab alias"
-					" %s to sysfs\n", s->name);
+					" %s to sysfs\n", al->name);
 		kfree(al);
 	}
 

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