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 597AEC28B2B for ; Sun, 14 Aug 2022 15:42:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240946AbiHNPmq (ORCPT ); Sun, 14 Aug 2022 11:42:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241309AbiHNPlR (ORCPT ); Sun, 14 Aug 2022 11:41:17 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B2A96220C9; Sun, 14 Aug 2022 08:32:55 -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 7FF8060BC9; Sun, 14 Aug 2022 15:32:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A55AC433D6; Sun, 14 Aug 2022 15:32:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660491173; bh=/QLmC2S3Y9ckObInugCjVY1KWeEqBnsxxCQOD44T8/k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ESU3NMTUPDOpRTJp+wm/at+NZsYoNb/XM2c9MS+Ybpt2p5OGycIQ+hRq8+4isqY4l OjPLVuzGT1rdNPrmG22UM48fmnkddyqSGWBNI2GKOhcxhRJnEzTxQou1egIpSGPaMT wk/dcTk5BeO0CwZmw3pkl/JhGWjT8tCjSPpl+hmtqgJHcEqzMH2HL0DWUlBTqKwvTu TwJ/P5vYUBT3CrX+X6FxIfw4APioassN8kdG44qLDYSXuqQHnuijtMbfA3T1BmAVKl Gok4yDCqSX2AcPaPZkUsqIrNwBxCoqmkWaE286NvkQOy7dyqBKIO+/RZgyB9FbzIDc 5IvbIeHmihpKA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Frank Li , Faqiang Zhu , Greg Kroah-Hartman , Sasha Levin , peter.chen@kernel.org, pawell@cadence.com, linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 04/46] usb: cdns3 fix use-after-free at workaround 2 Date: Sun, 14 Aug 2022 11:32:05 -0400 Message-Id: <20220814153247.2378312-4-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220814153247.2378312-1-sashal@kernel.org> References: <20220814153247.2378312-1-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/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 d6d515d598dc..c4f90b124e55 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