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 4B784C32772 for ; Tue, 23 Aug 2022 10:19:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353862AbiHWKS5 (ORCPT ); Tue, 23 Aug 2022 06:18:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352593AbiHWKIM (ORCPT ); Tue, 23 Aug 2022 06:08:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6726C61DBB; Tue, 23 Aug 2022 01:54:33 -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 02E786150F; Tue, 23 Aug 2022 08:54:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0AF6FC433C1; Tue, 23 Aug 2022 08:54:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661244872; bh=oJMCSW5rql9Q40OXoNYbb0n1b0xG0R5Y4bP304TLgHU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vcij6HdqAzdi5B3Ya1peIywjObds9WvHcOL5k8XPxq7xYqQ6+KpxvEE0yShw5uEvi UxH2GB6eNAAQOaCITRe92pp48U2yCMOfWh9HMDo6DRVL/sL8S3/xTaNOXF8i5tt0mj j6yywhpg4jpGia+GPUIObHNDhBIbTLMj7FyKoxvE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Frank Li , Faqiang Zhu , Sasha Levin Subject: [PATCH 5.15 165/244] usb: cdns3 fix use-after-free at workaround 2 Date: Tue, 23 Aug 2022 10:25:24 +0200 Message-Id: <20220823080104.723469870@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080059.091088642@linuxfoundation.org> References: <20220823080059.091088642@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: Frank Li [ Upstream commit 7d602f30149a117eea260208b1661bc404c21dfd ] BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac cdns3_wa2_remove_old_request() { ... kfree(priv_req->request.buf); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); ^^^ use after free ... } cdns3_gadget_ep_free_request() free the space pointed by priv_req, but priv_req is used in the following list_del_init(). This patch move list_del_init() before cdns3_gadget_ep_free_request(). Signed-off-by: Frank Li Signed-off-by: Faqiang Zhu Link: https://lore.kernel.org/r/20220608190430.2814358-1-Frank.Li@nxp.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/cdns3/cdns3-gadget.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index ae049eb28b93..4bcaed787c0f 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -625,9 +625,9 @@ static void cdns3_wa2_remove_old_request(struct cdns3_endpoint *priv_ep) trace_cdns3_wa2(priv_ep, "removes eldest request"); kfree(priv_req->request.buf); + list_del_init(&priv_req->list); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); - list_del_init(&priv_req->list); --priv_ep->wa2_counter; if (!chain) -- 2.35.1