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Thu, 8 Mar 2018 00:04:03 -0500 Received: from mail-co1nam03on0092.outbound.protection.outlook.com ([104.47.40.92]:45512 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966085AbeCHFEA (ORCPT ); Thu, 8 Mar 2018 00:04:00 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Loic Poulain , Marcel Holtmann , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 153/190] Bluetooth: btqcomsmd: Fix skb double free corruption Thread-Topic: [PATCH AUTOSEL for 4.9 153/190] Bluetooth: btqcomsmd: Fix skb double free corruption Thread-Index: AQHTtppPf4KU4wF3PUCx2PlgKImAqA== Date: Thu, 8 Mar 2018 04:59:59 +0000 Message-ID: <20180308045810.8041-153-alexander.levin@microsoft.com> References: <20180308045810.8041-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045810.8041-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0902;20:blq5u8zkCLigCyLgG28lsvZQGDG5IgCwBawLbAosm2eEmdp3gU4JwhSCeFTpinhftc4CgI0KNl+iQ9VA53n8YmvqBdHFVHx4d1zaTM6WLDqO9RjkAr9fze8FgRSy1mbTL9TSnUx5ZqGk34gaY8Ntie3tFK8DQACvI5O8eaAzdfo= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 99bff63e-2584-4623-4d7c-08d584b1fdf4 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0902; 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x-microsoft-antispam-message-info: Ktt4a4pd4T8l9B1CGJk3k4Cz29XTLyFeX4rE8JiufC5n/ErEYNRKDjFRSi+YD7Adr+pKANZyi/bbPYDPoz2cfA7VgldDxMpJUhnmXgCIbHFp2VUNxP5P+CzQZZov9aQ//ts1kB38jJOS2hqMYN2InwkSN2Mfz2B0V7wBpAyNfvh4dP2Ln1xs5DW+0XBRnyEF8J5A7hA+Z6nFbqohd0aLEU7TCosRqlhCXbnhbzv3toUzWvIL/gCfAiqB3gaANi1PB8reUdvQyW41AujyLJ38xxWbi940RO8i3thRxJg3zlE66OY3kkZyrKapL0bFTlUqWRqp0vvUkHZMgCy1NFKpcQ== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 99bff63e-2584-4623-4d7c-08d584b1fdf4 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 04:59:59.8803 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0902 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Loic Poulain [ Upstream commit 67b8fbead4685b36d290a0ef91c6ddffc4920ec9 ] In case of hci send frame failure, skb is still owned by the caller (hci_core) and then should not be freed. This fixes crash on dragonboard-410c when sending SCO packet. skb is freed by both btqcomsmd and hci_core. Fixes: 1511cc750c3d ("Bluetooth: Introduce Qualcomm WCNSS SMD based HCI dri= ver") Signed-off-by: Loic Poulain Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin --- drivers/bluetooth/btqcomsmd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c index 08c2c93887c1..3aac78a5091b 100644 --- a/drivers/bluetooth/btqcomsmd.c +++ b/drivers/bluetooth/btqcomsmd.c @@ -85,7 +85,8 @@ static int btqcomsmd_send(struct hci_dev *hdev, struct sk= _buff *skb) break; } =20 - kfree_skb(skb); + if (!ret) + kfree_skb(skb); =20 return ret; } --=20 2.14.1