linux-kernel - [PATCH 3.16 157/158] KEYS: Fix use-after-free in assoc_array

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Date:	Mon, 15 Sep 2014 12:26:36 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Andreea-Cristina Bernat <bernat.ada@...il.com>,
	David Howells <dhowells@...hat.com>, shemming@...cade.com,
	paulmck@...ux.vnet.ibm.com,
	James Morris <james.l.morris@...cle.com>
Subject: [PATCH 3.16 157/158] KEYS: Fix use-after-free in assoc_array_gc()

3.16-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 lib/assoc_array.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/assoc_array.c
+++ b/lib/assoc_array.c
@@ -1735,7 +1735,7 @@ 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:


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