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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44342C433EF for ; Wed, 6 Apr 2022 01:48:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1843982AbiDFBmn (ORCPT ); Tue, 5 Apr 2022 21:42:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241254AbiDEK3A (ORCPT ); Tue, 5 Apr 2022 06:29:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3E2DDBD2F; Tue, 5 Apr 2022 03:18:09 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C3215617A9; Tue, 5 Apr 2022 10:18:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D015EC385A1; Tue, 5 Apr 2022 10:18:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649153888; bh=83B7+j0bgXngSBFe4PwVfRvDLDVT04yMrm5iJHkxhQE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n6oQHAwZnQ2vci+6uNSc/iCXLRrCVhexMF6XK++OPlDiGcacIvHcDNiSxod16/uwc OkrtaBTewPnhvWF6N+SD653AJTFsGF7VMz57xIByKHOqmENCCUiZkETy/bQgSBcdxn nlaM+XohJRY/SVcSZdaXXGWdLkG5vqACPXNIEnIM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mark Chen , Sean Wang , Yake Yang , Marcel Holtmann , Sasha Levin Subject: [PATCH 5.10 366/599] Bluetooth: btmtksdio: Fix kernel oops in btmtksdio_interrupt Date: Tue, 5 Apr 2022 09:31:00 +0200 Message-Id: <20220405070309.722517516@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070258.802373272@linuxfoundation.org> References: <20220405070258.802373272@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yake Yang [ Upstream commit b062a0b9c1dc1ff63094337dccfe1568d5b62023 ] Fix the following kernel oops in btmtksdio_interrrupt [ 14.339134] btmtksdio_interrupt+0x28/0x54 [ 14.339139] process_sdio_pending_irqs+0x68/0x1a0 [ 14.339144] sdio_irq_work+0x40/0x70 [ 14.339154] process_one_work+0x184/0x39c [ 14.339160] worker_thread+0x228/0x3e8 [ 14.339168] kthread+0x148/0x3ac [ 14.339176] ret_from_fork+0x10/0x30 That happened because hdev->power_on is already called before sdio_set_drvdata which btmtksdio_interrupt handler relies on is not properly set up. The details are shown as the below: hci_register_dev would run queue_work(hdev->req_workqueue, &hdev->power_on) as WQ_HIGHPRI workqueue_struct to complete the power-on sequeunce and thus hci_power_on may run before sdio_set_drvdata is done in btmtksdio_probe. The hci_dev_do_open in hci_power_on would initialize the device and enable the interrupt and thus it is possible that btmtksdio_interrupt is being called right before sdio_set_drvdata is filled out. When btmtksdio_interrupt is being called and sdio_set_drvdata is not filled , the kernel oops is going to happen because btmtksdio_interrupt access an uninitialized pointer. Fixes: 9aebfd4a2200 ("Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices") Reviewed-by: Mark Chen Co-developed-by: Sean Wang Signed-off-by: Sean Wang Signed-off-by: Yake Yang Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin --- drivers/bluetooth/btmtksdio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c index 74856a586216..c41560be39fb 100644 --- a/drivers/bluetooth/btmtksdio.c +++ b/drivers/bluetooth/btmtksdio.c @@ -981,6 +981,8 @@ static int btmtksdio_probe(struct sdio_func *func, hdev->manufacturer = 70; set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); + sdio_set_drvdata(func, bdev); + err = hci_register_dev(hdev); if (err < 0) { dev_err(&func->dev, "Can't register HCI device\n"); @@ -988,8 +990,6 @@ static int btmtksdio_probe(struct sdio_func *func, return err; } - sdio_set_drvdata(func, bdev); - /* pm_runtime_enable would be done after the firmware is being * downloaded because the core layer probably already enables * runtime PM for this func such as the case host->caps & -- 2.34.1