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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 BA20BC4338F for ; Wed, 4 Aug 2021 15:52:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A80CD60F94 for ; Wed, 4 Aug 2021 15:52:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239624AbhHDPwj (ORCPT ); Wed, 4 Aug 2021 11:52:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239602AbhHDPwi (ORCPT ); Wed, 4 Aug 2021 11:52:38 -0400 Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6E00C0613D5; Wed, 4 Aug 2021 08:52:24 -0700 (PDT) Received: by mail-lf1-x129.google.com with SMTP id t9so5268886lfc.6; Wed, 04 Aug 2021 08:52:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=MBriIZ2G2M2XCFCkysf4584gS82vV2S0w04vsL/TpMs=; b=Y+U0o5F1svs/jTON0xwzaWelTku7kmvUmxAofy1IhwBSR4dN39oirQHZVq3+yvAv5k p9u1r/2yjY/OLkP3dRaDCqcd6udg+WW6lbe31uc1DqqPnPt14dT3Smwqcp45n746S2SJ xHanq1vCz360Bo5WqUKNIWZVFbEpLHQ9DZHvuumR7mY3oezazl75yzcP2vSJqhFKDcAy WGWgjMANS2Bp9rJzjyfsnpUWHbRFufaaL/7gUWBJMgVxes806gB8hpOO6dFXo/s2p4ur m2BK1vC/9+3cWLd1J66LYrnZ3Ps5iTBRngnahhoKBQCR7CmHLP17Q8ZM9XJMsjwdwJ94 Q26w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=MBriIZ2G2M2XCFCkysf4584gS82vV2S0w04vsL/TpMs=; b=kHuj+/qYRhx2HEET/rMKQnPbdxMZ+e8kP9eA8/j3bfEfiet5nQ9vRfmI9n1ORjmVYS 54MWHS+eLTX4m7xkibflGP3JXOWRwm2v9vJVpRs47MzbidFN1TKBLOXoojnSUqvtRgvp M5yJ4Jwghz8JdSl5U5lCn1R6WULmbZVAkMtDuqTfy9nr+8mEQeeeKf8BX4C/Mmyq0rq1 5ZrDvwPxV9lba4cZ3xspcbVre0HSsgxdhJwqas59lJo8/7WSidSUmIaeop6u3j0EXl1p lW43+JfJE7350SGSRXc0+ZWTqv+Ub5UU8DmGpz2sYtpAEVfbHmqLsYDKvBvFx2qs6Yr9 JtLQ== X-Gm-Message-State: AOAM531V/jlHFFsaJx9WWHEnOnNm6KkncMr2DY/LamR0vvXOAmzvLmG5 S53LvoxNIxUNIy/IYE+H7U8= X-Google-Smtp-Source: ABdhPJz3DE5NVTPwgg425Om0rpKX0sRS9HYPJc2IW5qT9x5uY5l/znGh/nF+XmkrVs1LYNeZTGE8dg== X-Received: by 2002:ac2:57c5:: with SMTP id k5mr21398920lfo.72.1628092343168; Wed, 04 Aug 2021 08:52:23 -0700 (PDT) Received: from localhost.localdomain ([94.103.226.235]) by smtp.gmail.com with ESMTPSA id x16sm230198lfa.244.2021.08.04.08.52.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 08:52:22 -0700 (PDT) From: Pavel Skripkin To: davem@davemloft.net, kuba@kernel.org, jdmason@kudzu.us, jesse.brandeburg@intel.com, colin.king@canonical.com Cc: dan.carpenter@oracle.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: [PATCH 2/2] net: vxge: fix use-after-free in vxge_device_unregister Date: Wed, 4 Aug 2021 18:52:20 +0300 Message-Id: X-Mailer: git-send-email 2.32.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Smatch says: drivers/net/ethernet/neterion/vxge/vxge-main.c:3518 vxge_device_unregister() error: Using vdev after free_{netdev,candev}(dev); drivers/net/ethernet/neterion/vxge/vxge-main.c:3518 vxge_device_unregister() error: Using vdev after free_{netdev,candev}(dev); drivers/net/ethernet/neterion/vxge/vxge-main.c:3520 vxge_device_unregister() error: Using vdev after free_{netdev,candev}(dev); drivers/net/ethernet/neterion/vxge/vxge-main.c:3520 vxge_device_unregister() error: Using vdev after free_{netdev,candev}(dev); Since vdev pointer is netdev private data accessing it after free_netdev() call can cause use-after-free bug. Fix it by moving free_netdev() call at the end of the function Fixes: 6cca200362b4 ("vxge: cleanup probe error paths") Reported-by: Dan Carpenter Signed-off-by: Pavel Skripkin --- drivers/net/ethernet/neterion/vxge/vxge-main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/neterion/vxge/vxge-main.c b/drivers/net/ethernet/neterion/vxge/vxge-main.c index 82eef4c72f01..7abd13e69471 100644 --- a/drivers/net/ethernet/neterion/vxge/vxge-main.c +++ b/drivers/net/ethernet/neterion/vxge/vxge-main.c @@ -3512,13 +3512,13 @@ static void vxge_device_unregister(struct __vxge_hw_device *hldev) kfree(vdev->vpaths); - /* we are safe to free it now */ - free_netdev(dev); - vxge_debug_init(vdev->level_trace, "%s: ethernet device unregistered", buf); vxge_debug_entryexit(vdev->level_trace, "%s: %s:%d Exiting...", buf, __func__, __LINE__); + + /* we are safe to free it now */ + free_netdev(dev); } /* -- 2.32.0