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Miller" , =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= Subject: [PATCH 10/19] staging: wfx: fix potential use-after-free Date: Fri, 15 May 2020 10:33:16 +0200 Message-Id: <20200515083325.378539-11-Jerome.Pouiller@silabs.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200515083325.378539-1-Jerome.Pouiller@silabs.com> References: <20200515083325.378539-1-Jerome.Pouiller@silabs.com> X-ClientProxiedBy: PR0P264CA0076.FRAP264.PROD.OUTLOOK.COM (2603:10a6:100:18::16) To MWHPR11MB1775.namprd11.prod.outlook.com (2603:10b6:300:10e::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pc-42.home (82.67.86.106) by PR0P264CA0076.FRAP264.PROD.OUTLOOK.COM (2603:10a6:100:18::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3000.24 via Frontend Transport; Fri, 15 May 2020 08:34:05 +0000 X-Mailer: git-send-email 2.26.2 X-Originating-IP: [82.67.86.106] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 141ff5bb-92f0-4cfe-62a6-08d7f8aabbac X-MS-TrafficTypeDiagnostic: MWHPR11MB1310: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:3968; X-Forefront-PRVS: 04041A2886 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: g10O0dick9Axs7LvbpGPnOZRJAAFwDJJR9oehfWBBMkJKIh/Wek0g16XhSby/Nj5sNfOD7TuywKlMNi+Djb4/6UOE8Lq60FW9z81iMIdUaFHfgR7XXDT+ZRPEmYxBeuT8/fEeDFu6flZxGGdxnoQBiFoFCPZndpq33Accog6xStWrFsqfPvQYf71f3TYdjzFf1Ul5D9DnIV9Cq1AjepJqASPHNZCHHal3302BE9hIey0XsUZ9PSxGuqMk4SxQcu1sEMqNqA1VsML0Fx0pe7QnB+b794qU1rq9hRLRq5ccslAzJ66i/Jz8/5he6BUBrmnsWH9AUU4HNJkjrhWQb+0yGM8HEc6hi+u3tipaKI54UKdasIrU+7th8Cpi0vcSCednPdtbnHqlVaI81lhE0pPF09s4ZW3DHx5hgpc4s9VTYUloXIFByg7m/Jaek2wBVdK X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR11MB1775.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(346002)(136003)(376002)(366004)(39850400004)(396003)(8886007)(66556008)(186003)(6512007)(4744005)(66946007)(6506007)(36756003)(316002)(66476007)(26005)(52116002)(16526019)(6666004)(54906003)(2906002)(2616005)(478600001)(66574014)(107886003)(956004)(8936002)(86362001)(8676002)(6486002)(5660300002)(4326008)(1076003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: vsxLaBW+KtWbiaWQYiGiL8mLPmd/vRbHAjN7Z9HW/RHy5cLucF4eUG6S2uB+xHVZS6J8zfH1clXp8Yi9Nr8oeXvJ4wsrutPpeRFCmx+Je8iND+OnDB+8vqAV+RwlT5tQy2K5cyaOk0vmpLG79jwtWUxFyaAbCVyp13wit7DWAJhlD2+HPLnkhO8b7GM4CKF7jSYc+iKDDSXvU+nTUlUSv2ioAXX+CwBZYqVgz4WFjPsekbPPfuVPl62VhY/dhkXost8nMGFCkp/NnzYboeNUXH+OdONghk02mRh51unuWic59xmrvkwwg7oF6QIWvO/uqsDuSa5xJt6GuULML65OzInZvQr4frb4xTRxattkml+dQiRLEzIxZLUuZ7ijMUn5fMpzaLzQDr6ZN5B4x/yzyOAq1T4brCMtiFFWuSi9aobNZGo4MjIh7uqZn3rEsH8wFD17UDk4oVxIcPkFeFXQLK3DhPcEjO4C6vwetqJngKo= X-OriginatorOrg: silabs.com X-MS-Exchange-CrossTenant-Network-Message-Id: 141ff5bb-92f0-4cfe-62a6-08d7f8aabbac X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 May 2020 08:34:07.5848 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 54dbd822-5231-4b20-944d-6f4abcd541fb X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: P3qjQrSmlEfp3IoHTDqUgzw80SW9BGHxYWnExmiu/ZBKKEYK1/JUhDhOEKbFkJ5fHWMStMhcLo1B/uyLBmJ5vw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB1310 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jérôme Pouiller wfx_tx_policy_put() use data from the skb. However, the call to skb_pull() has just discarded them (even if the memory is in fact not really discarded). Signed-off-by: Jérôme Pouiller --- drivers/staging/wfx/data_tx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c index 314cc2743a2b..d01e679b0880 100644 --- a/drivers/staging/wfx/data_tx.c +++ b/drivers/staging/wfx/data_tx.c @@ -494,8 +494,8 @@ static void wfx_skb_dtor(struct wfx_vif *wvif, struct sk_buff *skb) req->data_flags.fc_offset; WARN_ON(!wvif); - skb_pull(skb, offset); wfx_tx_policy_put(wvif, req->tx_flags.retry_policy_index); + skb_pull(skb, offset); ieee80211_tx_status_irqsafe(wvif->wdev->hw, skb); }