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 X-Spam-Level: X-Spam-Status: No, score=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1EBD1C4320A for ; Mon, 26 Jul 2021 15:58:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06F6860F70 for ; Mon, 26 Jul 2021 15:58:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236522AbhGZPS1 (ORCPT ); Mon, 26 Jul 2021 11:18:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:50962 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237105AbhGZPKU (ORCPT ); Mon, 26 Jul 2021 11:10:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8C6F16056C; Mon, 26 Jul 2021 15:50:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627314647; bh=y8PqjIkQNShzXhJ3wznCX353YdFhgkczSiqZ6JlyCOY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GYe3RCXNAF6HHrKgACKAA+CEk6iMc8TKVMb0LTDVAloOxWEfRfLOksOaDtNhRPfQO De8IDo21TtlHCwqTta7Okr3GXUirzpKQuWuEYSe4aLQZMPbqU8oYi6vCRIjlJotfqO llY75soPw7GLAUTOLGhtjqz/7eBhoVIVgpbiLPVQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Skripkin , "David S. Miller" Subject: [PATCH 4.19 042/120] net: moxa: fix UAF in moxart_mac_probe Date: Mon, 26 Jul 2021 17:38:14 +0200 Message-Id: <20210726153833.744659381@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210726153832.339431936@linuxfoundation.org> References: <20210726153832.339431936@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: linux-kernel@vger.kernel.org From: Pavel Skripkin commit c78eaeebe855fd93f2e77142ffd0404a54070d84 upstream. In case of netdev registration failure the code path will jump to init_fail label: init_fail: netdev_err(ndev, "init failed\n"); moxart_mac_free_memory(ndev); irq_map_fail: free_netdev(ndev); return ret; So, there is no need to call free_netdev() before jumping to error handling path, since it can cause UAF or double-free bug. Fixes: 6c821bd9edc9 ("net: Add MOXA ART SoCs ethernet driver") Signed-off-by: Pavel Skripkin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/moxa/moxart_ether.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/net/ethernet/moxa/moxart_ether.c +++ b/drivers/net/ethernet/moxa/moxart_ether.c @@ -538,10 +538,8 @@ static int moxart_mac_probe(struct platf SET_NETDEV_DEV(ndev, &pdev->dev); ret = register_netdev(ndev); - if (ret) { - free_netdev(ndev); + if (ret) goto init_fail; - } netdev_dbg(ndev, "%s: IRQ=%d address=%pM\n", __func__, ndev->irq, ndev->dev_addr);