linux-kernel - [PATCH 3.13 088/187] Bluetooth: Avoid use of session socket after the session gets freed

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Date:	Mon, 15 Sep 2014 15:08:18 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Vignesh Raman <Vignesh_Raman@...tor.com>,
	Vitaly Kuzmichev <Vitaly_Kuzmichev@...tor.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 088/187] Bluetooth: Avoid use of session socket after the session gets freed

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

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

From: Vignesh Raman <Vignesh_Raman@...tor.com>

commit 32333edb82fb2009980eefc5518100068147ab82 upstream.

The commits 08c30aca9e698faddebd34f81e1196295f9dc063 "Bluetooth: Remove
RFCOMM session refcnt" and 8ff52f7d04d9cc31f1e81dcf9a2ba6335ed34905
"Bluetooth: Return RFCOMM session ptrs to avoid freed session"
allow rfcomm_recv_ua and rfcomm_session_close to delete the session
(and free the corresponding socket) and propagate NULL session pointer
to the upper callers.

Additional fix is required to terminate the loop in rfcomm_process_rx
function to avoid use of freed 'sk' memory.

The issue is only reproducible with kernel option CONFIG_PAGE_POISONING
enabled making freed memory being changed and filled up with fixed char
value used to unmask use-after-free issues.

Signed-off-by: Vignesh Raman <Vignesh_Raman@...tor.com>
Signed-off-by: Vitaly Kuzmichev <Vitaly_Kuzmichev@...tor.com>
Acked-by: Dean Jenkins <Dean_Jenkins@...tor.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/bluetooth/rfcomm/core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index facd8a7..b088651 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -1859,10 +1859,13 @@ static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s)
 	/* Get data directly from socket receive queue without copying it. */
 	while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
 		skb_orphan(skb);
-		if (!skb_linearize(skb))
+		if (!skb_linearize(skb)) {
 			s = rfcomm_recv_frame(s, skb);
-		else
+			if (!s)
+				break;
+		} else {
 			kfree_skb(skb);
+		}
 	}
 
 	if (s && (sk->sk_state == BT_CLOSED))
-- 
1.9.1

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