linux-kernel - [PATCH 3.13 102/103] KEYS: Fix use-after-free in assoc_array

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Message-Id: <1412112708-27356-103-git-send-email-kamal@canonical.com>
Date:	Tue, 30 Sep 2014 14:31:47 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	David Howells <dhowells@...hat.com>, shemming@...cade.com,
	paulmck@...ux.vnet.ibm.com,
	James Morris <james.l.morris@...cle.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 102/103] KEYS: Fix use-after-free in assoc_array_gc()

3.13.11.8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@...hat.com>

commit 27419604f51a97d497853f14142c1059d46eb597 upstream.

An edit script should be considered inaccessible by a function once it has
called assoc_array_apply_edit() or assoc_array_cancel_edit().

However, assoc_array_gc() is accessing the edit script just after the
gc_complete: label.

Reported-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
cc: shemming@...cade.com
cc: paulmck@...ux.vnet.ibm.com
Signed-off-by: James Morris <james.l.morris@...cle.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 lib/assoc_array.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/assoc_array.c b/lib/assoc_array.c
index 76ae279..f9524b8 100644
--- a/lib/assoc_array.c
+++ b/lib/assoc_array.c
@@ -1737,7 +1737,7 @@ ascend_old_tree:
 gc_complete:
 	edit->set[0].to = new_root;
 	assoc_array_apply_edit(edit);
-	edit->array->nr_leaves_on_tree = nr_leaves_on_tree;
+	array->nr_leaves_on_tree = nr_leaves_on_tree;
 	return 0;
 
 enomem:
-- 
1.9.1

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