linux-kernel - [ 018/117] SELinux: if sel_make_bools errors dont leave inconsistent state

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Date:	Mon, 28 May 2012 04:12:20 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Eric Paris <eparis@...hat.com>
Subject: [ 018/117] SELinux: if sel_make_bools errors dont leave inconsistent state

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

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

From: Eric Paris <eparis@...hat.com>

commit 154c50ca4eb9ae472f50b6a481213e21ead4457d upstream.

We reset the bool names and values array to NULL, but do not reset the
number of entries in these arrays to 0.  If we error out and then get back
into this function we will walk these NULL pointers based on the belief
that they are non-zero length.

Signed-off-by: Eric Paris <eparis@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 security/selinux/selinuxfs.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 640feaa..4e93f9e 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1233,6 +1233,7 @@ static int sel_make_bools(void)
 		kfree(bool_pending_names[i]);
 	kfree(bool_pending_names);
 	kfree(bool_pending_values);
+	bool_num = 0;
 	bool_pending_names = NULL;
 	bool_pending_values = NULL;
 


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