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 AADBBC433FE for ; Mon, 21 Feb 2022 09:03:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347090AbiBUJEP (ORCPT ); Mon, 21 Feb 2022 04:04:15 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:45918 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347088AbiBUJD2 (ORCPT ); Mon, 21 Feb 2022 04:03:28 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5BCE2D1ED; Mon, 21 Feb 2022 00:58:32 -0800 (PST) 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 29EB5B80EB7; Mon, 21 Feb 2022 08:58:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68031C340E9; Mon, 21 Feb 2022 08:58:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1645433910; bh=S9gZPcdScvRNbdzVA9eIvwHOVONnGM7IUeu6UrDlv2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lu2LV/ZNPcqMnUs8U4FR9uhRAAQRoNrTSlNqjDFkvudZ4Atl0yIXNBOgSlufN9AMW NtSexv7QiJH7IIBkTX/ydIgxtln5exS+s0WhIJt7PC29l6mOWUlzD/AEfwnZRFjsyZ JPqgPta8Pn1LSItPCmDt9OY+97pt2rIivJNsMp6s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Agner , Wolfgang Walter , Jason Self , Dominik Behr , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Johannes Berg , Kalle Valo Subject: [PATCH 5.4 27/80] iwlwifi: fix use-after-free Date: Mon, 21 Feb 2022 09:49:07 +0100 Message-Id: <20220221084916.473428932@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220221084915.554151737@linuxfoundation.org> References: <20220221084915.554151737@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johannes Berg commit bea2662e7818e15d7607d17d57912ac984275d94 upstream. If no firmware was present at all (or, presumably, all of the firmware files failed to parse), we end up unbinding by calling device_release_driver(), which calls remove(), which then in iwlwifi calls iwl_drv_stop(), freeing the 'drv' struct. However the new code I added will still erroneously access it after it was freed. Set 'failure=false' in this case to avoid the access, all data was already freed anyway. Cc: stable@vger.kernel.org Reported-by: Stefan Agner Reported-by: Wolfgang Walter Reported-by: Jason Self Reported-by: Dominik Behr Reported-by: Marek Marczykowski-Górecki Fixes: ab07506b0454 ("iwlwifi: fix leaks/bad data after failed firmware load") Signed-off-by: Johannes Berg Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220208114728.e6b514cf4c85.Iffb575ca2a623d7859b542c33b2a507d01554251@changeid Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c @@ -1616,6 +1616,8 @@ static void iwl_req_fw_callback(const st out_unbind: complete(&drv->request_firmware_complete); device_release_driver(drv->trans->dev); + /* drv has just been freed by the release */ + failure = false; free: if (failure) iwl_dealloc_ucode(drv);