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 D4C23C00140 for ; Mon, 15 Aug 2022 19:32:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244751AbiHOTcl (ORCPT ); Mon, 15 Aug 2022 15:32:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344813AbiHOT1O (ORCPT ); Mon, 15 Aug 2022 15:27:14 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC07A5B04C; Mon, 15 Aug 2022 11:43:05 -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 ams.source.kernel.org (Postfix) with ESMTPS id 925B7B8105D; Mon, 15 Aug 2022 18:43:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5584C433D6; Mon, 15 Aug 2022 18:43:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660588983; bh=TyFNt0yGMX+HCgNReElfeOZCISJv3dIiyMGCwZjmTq8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ri+4kvwWsP1HDeZRpxFypFNc4xQKyKSXVnc31F6v2jFPJH5+VTFs1aoTWmbudTYae uRZnnaqdud1qBrGKRkQcHpkbcfHQqW+jFCTUwzXJN66PMrNaJqVg5tiGs2vXAiqHsV TVXemb/6h/xBgbz6aSGF9sgJReaNGMKjJkD7tl/k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathan Chancellor , Linus Torvalds , Sasha Levin Subject: [PATCH 5.15 559/779] usb: cdns3: Dont use priv_dev uninitialized in cdns3_gadget_ep_enable() Date: Mon, 15 Aug 2022 20:03:23 +0200 Message-Id: <20220815180401.230200387@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180337.130757997@linuxfoundation.org> References: <20220815180337.130757997@linuxfoundation.org> User-Agent: quilt/0.67 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: Nathan Chancellor [ Upstream commit 78acd4ca433425e6dd4032cfc2156c60e34931f2 ] Clang warns: drivers/usb/cdns3/cdns3-gadget.c:2290:11: error: variable 'priv_dev' is uninitialized when used here [-Werror,-Wuninitialized] dev_dbg(priv_dev->dev, "usbss: invalid parameters\n"); ^~~~~~~~ include/linux/dev_printk.h:155:18: note: expanded from macro 'dev_dbg' dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) ^~~ include/linux/dynamic_debug.h:167:7: note: expanded from macro 'dynamic_dev_dbg' dev, fmt, ##__VA_ARGS__) ^~~ include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call' func(&id, ##__VA_ARGS__); \ ^~~~~~~~~~~ drivers/usb/cdns3/cdns3-gadget.c:2278:31: note: initialize the variable 'priv_dev' to silence this warning struct cdns3_device *priv_dev; ^ = NULL 1 error generated. The priv_dev assignment was moved below the if statement to avoid potentially dereferencing ep before it was checked but priv_dev is used in the dev_dbg() call. To fix this, move the priv_dev and comp_desc assignments back to their original spot and hoist the ep check above those assignments with a call to pr_debug() instead of dev_dbg(). Fixes: c3ffc9c4ca44 ("usb: cdns3: change place of 'priv_ep' assignment in cdns3_gadget_ep_dequeue(), cdns3_gadget_ep_enable()") Link: https://github.com/ClangBuiltLinux/linux/issues/1680 Signed-off-by: Nathan Chancellor Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- drivers/usb/cdns3/cdns3-gadget.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index e0cf62e65075..ae049eb28b93 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -2280,16 +2280,20 @@ static int cdns3_gadget_ep_enable(struct usb_ep *ep, int ret = 0; int val; + if (!ep) { + pr_debug("usbss: ep not configured?\n"); + return -EINVAL; + } + priv_ep = ep_to_cdns3_ep(ep); + priv_dev = priv_ep->cdns3_dev; + comp_desc = priv_ep->endpoint.comp_desc; - if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { + if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) { dev_dbg(priv_dev->dev, "usbss: invalid parameters\n"); return -EINVAL; } - comp_desc = priv_ep->endpoint.comp_desc; - priv_dev = priv_ep->cdns3_dev; - if (!desc->wMaxPacketSize) { dev_err(priv_dev->dev, "usbss: missing wMaxPacketSize\n"); return -EINVAL; -- 2.35.1