From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12FA9C4321D for ; Wed, 22 Aug 2018 12:20:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B41A920C0D for ; Wed, 22 Aug 2018 12:20:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="NodlkYAA"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="NodlkYAA" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B41A920C0D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728745AbeHVPpS (ORCPT ); Wed, 22 Aug 2018 11:45:18 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:37778 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727835AbeHVPpR (ORCPT ); Wed, 22 Aug 2018 11:45:17 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id EBFD26028E; Wed, 22 Aug 2018 12:20:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1534940434; bh=pu/pFGyUym7g9pVVIXYpN+MNAX6YC3+6vszN6lfhlKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NodlkYAA6Tj2hpeYnqE5upJN9AP72mL2kLpUHMFJsGrvvpPUj4g3E+k6TBbZUTK9Z 1TUuvvr+NIwK4qoVm1Fdz0KXFQBKj3k3xh3xLXxZBMaq220TMjGbjjK+JHf6PihMfp LKu2I27+9cCJxMxh+Zp6Ls2lN/EBfIvLM6w3npws= Received: from bgodavar-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bgodavar@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7C5166037B; Wed, 22 Aug 2018 12:20:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1534940434; bh=pu/pFGyUym7g9pVVIXYpN+MNAX6YC3+6vszN6lfhlKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NodlkYAA6Tj2hpeYnqE5upJN9AP72mL2kLpUHMFJsGrvvpPUj4g3E+k6TBbZUTK9Z 1TUuvvr+NIwK4qoVm1Fdz0KXFQBKj3k3xh3xLXxZBMaq220TMjGbjjK+JHf6PihMfp LKu2I27+9cCJxMxh+Zp6Ls2lN/EBfIvLM6w3npws= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7C5166037B Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=bgodavar@codeaurora.org From: Balakrishna Godavarthi To: marcel@holtmann.org, johan.hedberg@gmail.com Cc: mka@chromium.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, hemantg@codeaurora.org, linux-arm-msm@vger.kernel.org, Balakrishna Godavarthi Subject: [PATCH v1 2/2] Bluetooth: hci_qca: Remove hdev dereference in qca_close(). Date: Wed, 22 Aug 2018 17:50:05 +0530 Message-Id: <20180822122005.11218-3-bgodavar@codeaurora.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180822122005.11218-1-bgodavar@codeaurora.org> References: <20180822122005.11218-1-bgodavar@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When flag KASAN is set, we are seeing an following crash while removing hci_uart module. [ 50.589909] Unable to handle kernel paging request at virtual address 6b6b6b6b6b6b73 [ 50.597902] Mem abort info: [ 50.600846] Exception class = DABT (current EL), IL = 32 bits [ 50.606959] SET = 0, FnV = 0 [ 50.610142] EA = 0, S1PTW = 0 [ 50.613396] Data abort info: [ 50.616401] ISV = 0, ISS = 0x00000004 [ 50.620373] CM = 0, WnR = 0 [ 50.623466] [006b6b6b6b6b6b73] address between user and kernel address ranges [ 50.630818] Internal error: Oops: 96000004 [#1] PREEMPT SMP [ 50.671670] PC is at qca_power_shutdown+0x28/0x100 [hci_uart] [ 50.677593] LR is at qca_close+0x74/0xb0 [hci_uart] [ 50.775689] Process rmmod (pid: 2144, stack limit = 0xffffff801ba90000) [ 50.782493] Call trace: [ 50.872150] [] qca_power_shutdown+0x28/0x100 [hci_uart] [ 50.879138] [] qca_close+0x74/0xb0 [hci_uart] [ 50.885238] [] hci_uart_unregister_device+0x44/0x50 [hci_uart] [ 50.892846] [] qca_serdev_remove+0x50/0x5c [hci_uart] [ 50.899654] [] serdev_drv_remove+0x28/0x38 [ 50.905489] [] device_release_driver_internal+0x140/0x1e4 [ 50.912653] [] driver_detach+0x78/0x84 [ 50.918121] [] bus_remove_driver+0x80/0xa8 [ 50.923942] [] driver_unregister+0x4c/0x58 [ 50.929768] [] qca_deinit+0x24/0x598 [hci_uart] [ 50.936045] [] hci_uart_exit+0x10/0x48 [hci_uart] [ 50.942495] [] SyS_delete_module+0x17c/0x224 This crash is due to dereference of hdev, after freeing it. Signed-off-by: Balakrishna Godavarthi --- drivers/bluetooth/hci_qca.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index a740d5703914..74f5fede0274 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -167,7 +167,7 @@ struct qca_serdev { }; static int qca_power_setup(struct hci_uart *hu, bool on); -static void qca_power_shutdown(struct hci_dev *hdev); +static void qca_power_shutdown(struct hci_uart *hu); static void __serial_clock_on(struct tty_struct *tty) { @@ -608,7 +608,7 @@ static int qca_close(struct hci_uart *hu) if (hu->serdev) { qcadev = serdev_device_get_drvdata(hu->serdev); if (qcadev->btsoc_type == QCA_WCN3990) - qca_power_shutdown(hu->hdev); + qca_power_shutdown(hu); else gpiod_set_value_cansleep(qcadev->bt_en, 0); @@ -1230,12 +1230,15 @@ static const struct qca_vreg_data qca_soc_data = { .num_vregs = 4, }; -static void qca_power_shutdown(struct hci_dev *hdev) +static void qca_power_shutdown(struct hci_uart *hu) { - struct hci_uart *hu = hci_get_drvdata(hdev); + struct serdev_device *serdev = hu->serdev; + unsigned char cmd = QCA_WCN3990_POWEROFF_PULSE; host_set_baudrate(hu, 2400); - qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE); + hci_uart_set_flow_control(hu, true); + serdev_device_write_buf(serdev, &cmd, sizeof(cmd)); + hci_uart_set_flow_control(hu, false); qca_power_setup(hu, false); } @@ -1411,7 +1414,7 @@ static void qca_serdev_remove(struct serdev_device *serdev) struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); if (qcadev->btsoc_type == QCA_WCN3990) - qca_power_shutdown(qcadev->serdev_hu.hdev); + qca_power_shutdown(&qcadev->serdev_hu); else clk_disable_unprepare(qcadev->susclk); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project