linux-kernel - [PATCH 3.11 001/137] Bluetooth: Ignore H5 non-link packets in non-active state

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Message-Id: <1408354398-10226-2-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 18 Aug 2014 10:31:02 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Loic Poulain <loic.poulain@...el.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 001/137] Bluetooth: Ignore H5 non-link packets in non-active state

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

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

From: Loic Poulain <loic.poulain@...el.com>

commit 48439d501e3d9e8634bdc0c418e066870039599d upstream.

When detecting a non-link packet, h5_reset_rx() frees the Rx skb.
Not returning after that will cause the upcoming h5_rx_payload()
call to dereference a now NULL Rx skb and trigger a kernel oops.

Signed-off-by: Loic Poulain <loic.poulain@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/bluetooth/hci_h5.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index b6154d5a07a5..db0be2fb05fe 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -406,6 +406,7 @@ static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
 	    H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) {
 		BT_ERR("Non-link packet received in non-active state");
 		h5_reset_rx(h5);
+		return 0;
 	}
 
 	h5->rx_func = h5_rx_payload;
-- 
1.9.1

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