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=-20.2 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, 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 5FCC7C07E9D for ; Mon, 19 Jul 2021 14:59:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4472261002 for ; Mon, 19 Jul 2021 14:59:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241481AbhGSOS6 (ORCPT ); Mon, 19 Jul 2021 10:18:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:53044 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242011AbhGSOSI (ORCPT ); Mon, 19 Jul 2021 10:18:08 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 902A361165; Mon, 19 Jul 2021 14:58:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626706728; bh=DZalicG3Ef/s00rI40cRfPHZVROuINZ5gPUr7Dt17H8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fJVz14DDQ/HiXOGzNsFWJ2X7Kr9g0Wd+khrFF+fIWNsI2RljiP0r3Z1lW5FQ3a2Z7 B12DwbYQ7pifnBdikPfgp9y8Q6W91ABZxep80oUdg2dGFhUJ7qPqm/1dNNmUXo4PZm ijj92Rk4H8pv3HeteqqV1XUSu9KuaSgdlCYqbIwM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Skripkin , "David S. Miller" , Sasha Levin Subject: [PATCH 4.4 071/188] net: ethernet: ezchip: fix UAF in nps_enet_remove Date: Mon, 19 Jul 2021 16:50:55 +0200 Message-Id: <20210719144929.563637232@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144913.076563739@linuxfoundation.org> References: <20210719144913.076563739@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 [ Upstream commit e4b8700e07a86e8eab6916aa5c5ba99042c34089 ] priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after netif_napi_del() call. Fixes: 0dd077093636 ("NET: Add ezchip ethernet driver") Signed-off-by: Pavel Skripkin Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/ezchip/nps_enet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c index b1026689b78f..73d2bc349b2f 100644 --- a/drivers/net/ethernet/ezchip/nps_enet.c +++ b/drivers/net/ethernet/ezchip/nps_enet.c @@ -621,8 +621,8 @@ static s32 nps_enet_remove(struct platform_device *pdev) struct nps_enet_priv *priv = netdev_priv(ndev); unregister_netdev(ndev); - free_netdev(ndev); netif_napi_del(&priv->napi); + free_netdev(ndev); return 0; } -- 2.30.2