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 32515C25B06 for ; Sun, 14 Aug 2022 15:53:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241976AbiHNPw7 (ORCPT ); Sun, 14 Aug 2022 11:52:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241280AbiHNPtZ (ORCPT ); Sun, 14 Aug 2022 11:49:25 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DFF2011801; Sun, 14 Aug 2022 08:35:36 -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 874C3B80B43; Sun, 14 Aug 2022 15:35:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57B07C43470; Sun, 14 Aug 2022 15:35:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660491335; bh=alwZg7Pm/vtkDLVFTe2uuR2ES6OCPdj8VDhWPiZKH8Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VTRESsmlrFswBSb9/Y+iCPdoEvkNIhCujnAC8nbCVHT0lzpgCN+gmg753qjxyHgbV EbAY7/xJ4L0pwKPtCZdt0q7hq9koYYG4Dg2fcOLd92Ps/7GU3kSKCMwq7/fTSPmIHM orbGJDNqqZtI8nkdTjyxfZkM0EvYiHS2Em1OJtkSgfT04Jyhb8DfQDpiw8O21Ip1qO Yfxk4Eg8ZVO+uH+n84kk+Usx4EZ6yxiaRxDhkfKZtwvT7PWqKsF6d6+jfv6PJfwpYj qn2NziViTjVgS1H2iMf06uyjWWLRRRLQ1ZiEIXlZwbxsD9eqW4+FsqDI8KiNIBmROl 8J54TXcYU48vg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Frank Li , Faqiang Zhu , Greg Kroah-Hartman , Sasha Levin , pawell@cadence.com, peter.chen@kernel.org, linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 02/21] usb: cdns3 fix use-after-free at workaround 2 Date: Sun, 14 Aug 2022 11:35:12 -0400 Message-Id: <20220814153531.2379705-2-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220814153531.2379705-1-sashal@kernel.org> References: <20220814153531.2379705-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@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/gadget.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c index 296f2ee1b680..a9399f2b3930 100644 --- a/drivers/usb/cdns3/gadget.c +++ b/drivers/usb/cdns3/gadget.c @@ -549,9 +549,9 @@ 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