From patchwork Tue Jul 13 10:58:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 475088 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 92438C07E95 for ; Tue, 13 Jul 2021 10:59:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FD436127C for ; Tue, 13 Jul 2021 10:59:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235800AbhGMLBu (ORCPT ); Tue, 13 Jul 2021 07:01:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235390AbhGMLBt (ORCPT ); Tue, 13 Jul 2021 07:01:49 -0400 Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42BA9C0613DD; Tue, 13 Jul 2021 03:58:59 -0700 (PDT) Received: by mail-lf1-x12d.google.com with SMTP id v6so12342362lfp.6; Tue, 13 Jul 2021 03:58:59 -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:mime-version :content-transfer-encoding; bh=D9zpTdN6p7SwNXQB1vuqj99Xdu6Hr8oPzuitgbMbnZk=; b=ZTn/WbFDqY9SPvf3lVVTkPfOrI5ttwO9SW0TSXDm2iFHdX8XB5zQ2x6G4XYT1UgUpg a3H+KqkJfkuVMp7uYIX22W7rEp/V06WBquLqI0hgEqBEbIfkkzz4XDNfv34OPNRNZEGn ZOK7klAN++kcFMvp2Kj52zf7rO57FcF6co/QtpeZYUdTF9l0WnjqXndAb/ORhNfoQKLH COAB5jL6JuLSEki7Un8IrS3SBUNqtPykbLHhfDM0g36cGC/X+DB75JdNtMgLjiEQ0ALX OmDvh/92srotT25b0RFy3APdl/KRPDP2sUPtLJMuVX6asw8DfDikuXAv8dFPLqAie7NS 9lIA== 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:mime-version :content-transfer-encoding; bh=D9zpTdN6p7SwNXQB1vuqj99Xdu6Hr8oPzuitgbMbnZk=; b=iYJ+fjK7a+p/t6dLo1d/jLQLAVfmUvLEu7EU8Mj3/a7A00BZ23mqcUh9SUTvJVe/kV nWwMUL6NNwYYqinx2NlSlHotpXVp2QV7Gj9qaTO5EsbUy6xEImVxmvUi5XmbtG2GdCzo cVN3eUJnBxDw5dxVNr/ZdwrxIKZ6565ea6Ea3YPAyrQzsDBGqIzuXWmrcbA5huMKXWeU KNUesNu6rIlh75hDLZFRGzBdPUKp4E6ESnipfFjlnJpRlf7ySpY1FyfhpnTIFjnpuIDu uHmJeRhXpdIZHFz80LwWSCP8KGUiv+zVwhf6Zj9oIPA+K40SkP4KUFh+wwp7zAdzXxOj wN4Q== X-Gm-Message-State: AOAM530Nt++gAQ1Uzji/ThU9GxOovvLT+oqFcwuTulxtPMUnNUEct9ub 0Jrg06ihRARSqQ3vQiBbhLtrV6VGubcnlw== X-Google-Smtp-Source: ABdhPJzfXrm6xvAzy0gVpRtApq3vqO52EaQJHWWR3f0EimmrNTPumFpYfZ2b3NJLxHtx0ULx1SP+vw== X-Received: by 2002:a05:6512:230d:: with SMTP id o13mr2900964lfu.557.1626173937603; Tue, 13 Jul 2021 03:58:57 -0700 (PDT) Received: from localhost.localdomain ([94.103.229.115]) by smtp.gmail.com with ESMTPSA id i67sm208006lji.60.2021.07.13.03.58.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jul 2021 03:58:57 -0700 (PDT) From: Pavel Skripkin To: macro@orcam.me.uk, davem@davemloft.net Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: [PATCH] net: fddi: fix UAF in fza_probe Date: Tue, 13 Jul 2021 13:58:53 +0300 Message-Id: <20210713105853.8979-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org fp is netdev private data and it cannot be used after free_netdev() call. Using fp after free_netdev() can cause UAF bug. Fix it by moving free_netdev() after error message. Fixes: 61414f5ec983 ("FDDI: defza: Add support for DEC FDDIcontroller 700 TURBOchannel adapter") Signed-off-by: Pavel Skripkin Reviewed-by: Maciej W. Rozycki --- drivers/net/fddi/defza.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/net/fddi/defza.c b/drivers/net/fddi/defza.c index 14f07050b6b1..0de2c4552f5e 100644 --- a/drivers/net/fddi/defza.c +++ b/drivers/net/fddi/defza.c @@ -1504,9 +1504,8 @@ static int fza_probe(struct device *bdev) release_mem_region(start, len); err_out_kfree: - free_netdev(dev); - pr_err("%s: initialization failure, aborting!\n", fp->name); + free_netdev(dev); return ret; }