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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 77CBBC17440 for ; Wed, 13 Nov 2019 02:05:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4706A21783 for ; Wed, 13 Nov 2019 02:05:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573610709; bh=Ezy/2toqxH4vDYuGNzQ7l2KT4KeAUcuyJ9W611bMqB8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JH9cZguKw/Q/CdL0n6n2u8dDRYj6y1nPuwxOnyCPu5f86SOq4VBI/+H/b3uTsLKUO aQSVG8+dRW0nlBx6b+uTHhTIfuqSISuHhsiJExZEkXG5sIGRYXCU1KqP47TegGvB4A 2nYkT5zXAnIYfuOnUHJN/PpnisA8R2tvJfxJxVx8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730864AbfKMCBr (ORCPT ); Tue, 12 Nov 2019 21:01:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:57798 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730822AbfKMCBm (ORCPT ); Tue, 12 Nov 2019 21:01:42 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3D6A12246D; Wed, 13 Nov 2019 02:01:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573610501; bh=Ezy/2toqxH4vDYuGNzQ7l2KT4KeAUcuyJ9W611bMqB8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dVA+F592UgqoA0Hg6yAN3vfjDFUxcSUgDfha0ekSN92yESGpa/itfFe5Gb08T8LfQ HQm5Jza/ga/qWL/w/uzIGUhFk3qFB2PEdkU8Com70+0eQ3+SsvoHIkyIN6YcCvdbbW Hq0bzG1ZpJXRR+VyerFMvX84n/LNoKj4glD8socs= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jia-Ju Bai , Felipe Balbi , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 07/48] usb: gadget: udc: fotg210-udc: Fix a sleep-in-atomic-context bug in fotg210_get_status() Date: Tue, 12 Nov 2019 21:00:50 -0500 Message-Id: <20191113020131.13356-7-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191113020131.13356-1-sashal@kernel.org> References: <20191113020131.13356-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 2337a77c1cc86bc4e504ecf3799f947659c86026 ] The driver may sleep in an interrupt handler. The function call path (from bottom to top) in Linux-4.17 is: [FUNC] fotg210_ep_queue(GFP_KERNEL) drivers/usb/gadget/udc/fotg210-udc.c, 744: fotg210_ep_queue in fotg210_get_status drivers/usb/gadget/udc/fotg210-udc.c, 768: fotg210_get_status in fotg210_setup_packet drivers/usb/gadget/udc/fotg210-udc.c, 949: fotg210_setup_packet in fotg210_irq (interrupt handler) To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC. If possible, spin_unlock() and spin_lock() around fotg210_ep_queue() can be also removed. This bug is found by my static analysis tool DSAC. Signed-off-by: Jia-Ju Bai Signed-off-by: Felipe Balbi Signed-off-by: Sasha Levin --- drivers/usb/gadget/udc/fotg210-udc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/fotg210-udc.c b/drivers/usb/gadget/udc/fotg210-udc.c index 95df2b3bb6a1a..76e991557116a 100644 --- a/drivers/usb/gadget/udc/fotg210-udc.c +++ b/drivers/usb/gadget/udc/fotg210-udc.c @@ -744,7 +744,7 @@ static void fotg210_get_status(struct fotg210_udc *fotg210, fotg210->ep0_req->length = 2; spin_unlock(&fotg210->lock); - fotg210_ep_queue(fotg210->gadget.ep0, fotg210->ep0_req, GFP_KERNEL); + fotg210_ep_queue(fotg210->gadget.ep0, fotg210->ep0_req, GFP_ATOMIC); spin_lock(&fotg210->lock); } -- 2.20.1