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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 0AB42C35642 for ; Fri, 21 Feb 2020 07:46:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D138524672 for ; Fri, 21 Feb 2020 07:46:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582271179; bh=U8gWgSTY/YoEU4F+UmoZGFPHS7racHGq+NDlydgsKt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GnOC81prIurBg3uk3Vf1m+NL4kz7yBxw9SYxV6LkGlPZeRCZgNsHNUZYCwF9dXlRF bOdyDVIT8L+j2hUY9y519VxuejN/NbqRzke8oO73dqIzMwYvmfzw9wRfhMlTEW1tSn jjdliNx64jxxKnl6IDeMsLynQF1PLXGNaokY2Iwc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728665AbgBUHqT (ORCPT ); Fri, 21 Feb 2020 02:46:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:41692 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727670AbgBUHqP (ORCPT ); Fri, 21 Feb 2020 02:46:15 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A20A224650; Fri, 21 Feb 2020 07:46:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582271175; bh=U8gWgSTY/YoEU4F+UmoZGFPHS7racHGq+NDlydgsKt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=R+xWmPWjWLi2PwfAidYRDETWcxpI9s20jetHaoV/rDgtmnrZaAttbw3zhDOKZZiHr HMlHHjgPU3Izvh2Zi8S2BDoub67RPq4n7xchEVXsbLL7r7HI5+dAJyq/gi2HPkWbrI vkSkUr42NFE/2DvcsjNuPEt57hyYxZ8yqV9JL+0Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jia-Ju Bai , Felipe Balbi , Sasha Levin Subject: [PATCH 5.5 066/399] usb: gadget: udc: fix possible sleep-in-atomic-context bugs in gr_probe() Date: Fri, 21 Feb 2020 08:36:31 +0100 Message-Id: <20200221072408.782932904@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200221072402.315346745@linuxfoundation.org> References: <20200221072402.315346745@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jia-Ju Bai [ Upstream commit 9c1ed62ae0690dfe5d5e31d8f70e70a95cb48e52 ] The driver may sleep while holding a spinlock. The function call path (from bottom to top) in Linux 4.19 is: drivers/usb/gadget/udc/core.c, 1175: kzalloc(GFP_KERNEL) in usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c, 1272: usb_add_gadget_udc_release in usb_add_gadget_udc drivers/usb/gadget/udc/gr_udc.c, 2186: usb_add_gadget_udc in gr_probe drivers/usb/gadget/udc/gr_udc.c, 2183: spin_lock in gr_probe drivers/usb/gadget/udc/core.c, 1195: mutex_lock in usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c, 1272: usb_add_gadget_udc_release in usb_add_gadget_udc drivers/usb/gadget/udc/gr_udc.c, 2186: usb_add_gadget_udc in gr_probe drivers/usb/gadget/udc/gr_udc.c, 2183: spin_lock in gr_probe drivers/usb/gadget/udc/gr_udc.c, 212: debugfs_create_file in gr_probe drivers/usb/gadget/udc/gr_udc.c, 2197: gr_dfs_create in gr_probe drivers/usb/gadget/udc/gr_udc.c, 2183: spin_lock in gr_probe drivers/usb/gadget/udc/gr_udc.c, 2114: devm_request_threaded_irq in gr_request_irq drivers/usb/gadget/udc/gr_udc.c, 2202: gr_request_irq in gr_probe drivers/usb/gadget/udc/gr_udc.c, 2183: spin_lock in gr_probe kzalloc(GFP_KERNEL), mutex_lock(), debugfs_create_file() and devm_request_threaded_irq() can sleep at runtime. To fix these possible bugs, usb_add_gadget_udc(), gr_dfs_create() and gr_request_irq() are called without handling the spinlock. These bugs are found by a static analysis tool STCheck written by myself. Signed-off-by: Jia-Ju Bai Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/gadget/udc/gr_udc.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/usb/gadget/udc/gr_udc.c b/drivers/usb/gadget/udc/gr_udc.c index 64d80c65bb967..aaf975c809bf9 100644 --- a/drivers/usb/gadget/udc/gr_udc.c +++ b/drivers/usb/gadget/udc/gr_udc.c @@ -2175,8 +2175,6 @@ static int gr_probe(struct platform_device *pdev) return -ENOMEM; } - spin_lock(&dev->lock); - /* Inside lock so that no gadget can use this udc until probe is done */ retval = usb_add_gadget_udc(dev->dev, &dev->gadget); if (retval) { @@ -2185,15 +2183,21 @@ static int gr_probe(struct platform_device *pdev) } dev->added = 1; + spin_lock(&dev->lock); + retval = gr_udc_init(dev); - if (retval) + if (retval) { + spin_unlock(&dev->lock); goto out; - - gr_dfs_create(dev); + } /* Clear all interrupt enables that might be left on since last boot */ gr_disable_interrupts_and_pullup(dev); + spin_unlock(&dev->lock); + + gr_dfs_create(dev); + retval = gr_request_irq(dev, dev->irq); if (retval) { dev_err(dev->dev, "Failed to request irq %d\n", dev->irq); @@ -2222,8 +2226,6 @@ static int gr_probe(struct platform_device *pdev) dev_info(dev->dev, "regs: %p, irq %d\n", dev->regs, dev->irq); out: - spin_unlock(&dev->lock); - if (retval) gr_remove(pdev); -- 2.20.1