From nobody Sun Sep 22 13:33:35 2024 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 9FCFEC433EF for ; Tue, 30 Nov 2021 11:09:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237207AbhK3LMR (ORCPT ); Tue, 30 Nov 2021 06:12:17 -0500 Received: from mta-p8.oit.umn.edu ([134.84.196.208]:38912 "EHLO mta-p8.oit.umn.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237162AbhK3LMP (ORCPT ); Tue, 30 Nov 2021 06:12:15 -0500 Received: from localhost (unknown [127.0.0.1]) by mta-p8.oit.umn.edu (Postfix) with ESMTP id 4J3KGc1RLCz9vKY8 for ; Tue, 30 Nov 2021 11:08:56 +0000 (UTC) X-Virus-Scanned: amavisd-new at umn.edu Received: from mta-p8.oit.umn.edu ([127.0.0.1]) by localhost (mta-p8.oit.umn.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id R1_7z_B3r8-a for ; Tue, 30 Nov 2021 05:08:56 -0600 (CST) Received: from mail-pg1-f198.google.com (mail-pg1-f198.google.com [209.85.215.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mta-p8.oit.umn.edu (Postfix) with ESMTPS id 4J3KGb6Nxpz9vKY6 for ; Tue, 30 Nov 2021 05:08:55 -0600 (CST) DMARC-Filter: OpenDMARC Filter v1.3.2 mta-p8.oit.umn.edu 4J3KGb6Nxpz9vKY6 DKIM-Filter: OpenDKIM Filter v2.11.0 mta-p8.oit.umn.edu 4J3KGb6Nxpz9vKY6 Received: by mail-pg1-f198.google.com with SMTP id t18-20020a632252000000b003252b088f26so6587370pgm.7 for ; Tue, 30 Nov 2021 03:08:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=umn.edu; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=L4d1W48kwHHShV4SEtnKYtW4rYy9ZnpgrsWKK2v2g6k=; b=GtUW2K/WOpbVkir7I1Tp3FYTarK7YibkN6sNrEotnvhlY9v5OkC6trHYw/B6W6GjNZ 4QDcoIiSn2o2iY7sELuG/ejW1DjHwKq1RYQVQbSNIJ18HagJl369LgtwiHS69lr/OWGc T9klLrFg/3MncZKUeJdY/41Nas3lB1ZKkmi6o0b17UpILbv1gUq3KQhRhVdTq7ILe1UQ zd2T9i+Shr2di+mwZKL2sfYUGLgkWXi+38tyEylmcQsJ906rVrb3hH9PkJUybA6jRDf1 66DsXXSuyZu/3SQ4JzMMN/tXeMdQW1XDcmv1O/Fw5YSblxekSdVUFaMQ+a8OokZdhSIk t//g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=L4d1W48kwHHShV4SEtnKYtW4rYy9ZnpgrsWKK2v2g6k=; b=C0xxWl42hqXrY8aOghzT92u4lvJ+RG1co8h4x4qxB+XqUB0x9MsEtYHnD54BumPraJ rasxryT/LnSxYjEYJEi6lMJXgGXowWLq78GxeNw2L0sfLeiinI57qKke6ZH9RCqANYaV 0prG5BIMJm9DwSgSHX2iZtiHeFB5ds6f/5nLYLa5DyQPHFU6n4iGbS+ZpBl3qMgBCvep PqBh19BAQsdYcJp85olKd/6Rq4JS1UFhfIVo81Gi3zaDollI91Yfs27W2ZS7m1bQdUvY cOoibM118xBXFv8fOghdyHrBc1Po2NJhNXeB+AnYqx4tsyKjZwLYBxW3cfZvUyPqFC+r Qk7A== X-Gm-Message-State: AOAM532eCd3x/4oj0vlB41ClCtIcclFSpGMzQUnNUY7W3E4pX1JgesyL uzv5IgiNFhFnO2pcVPiQnaHzdUCZfvU32s0XYlFbzKnwFg1MwD+DAbbrMk6tvhMFkbh52Cysc8/ DXjgm+C5fQcukZHMYqsUBDAakwTPo X-Received: by 2002:a63:5204:: with SMTP id g4mr12856344pgb.319.1638270535143; Tue, 30 Nov 2021 03:08:55 -0800 (PST) X-Google-Smtp-Source: ABdhPJyhQMDrKlRy9nZ2NlLQm9ytvcBmwZ3NlEtd489Hx6S5Lk90kMvYdn8hmVlN3kWuCXwOlhER/w== X-Received: by 2002:a63:5204:: with SMTP id g4mr12856329pgb.319.1638270534953; Tue, 30 Nov 2021 03:08:54 -0800 (PST) Received: from zqy787-GE5S.lan ([36.7.42.137]) by smtp.gmail.com with ESMTPSA id u38sm23783318pfg.0.2021.11.30.03.08.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Nov 2021 03:08:54 -0800 (PST) From: Zhou Qingyang To: zhou1615@umn.edu Cc: kjlu@umn.edu, Shahed Shaikh , Manish Chopra , GR-Linux-NIC-Dev@marvell.com, "David S. Miller" , Jakub Kicinski , Matthias Brugger , Sucheta Chakraborty , Sritej Velaga , Sony Chacko , Anirban Chakraborty , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH] clk: mediatek: net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings() Date: Tue, 30 Nov 2021 19:08:48 +0800 Message-Id: <20211130110848.109026-1-zhou1615@umn.edu> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In qlcnic_83xx_add_rings(), the indirect function of ahw->hw_ops->alloc_mbx_args will be called to allocate memory for cmd.req.arg, and there is a dereference of it in qlcnic_83xx_add_rings(), which could lead to a NULL pointer dereference on failure of the indirect function like qlcnic_83xx_alloc_mbx_args(). Fix this bug by adding a check of alloc_mbx_args(), this patch imitates the logic of mbx_cmd()'s failure handling. This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_QLCNIC=3Dm show no new warnings, and our static analyzer no longer warns about this code. Fixes: 7f9664525f9c ("qlcnic: 83xx memory map and HW access routine") Signed-off-by: Zhou Qingyang --- drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c b/drivers/= net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c index d51bac7ba5af..bd0607680329 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c @@ -1077,8 +1077,14 @@ static int qlcnic_83xx_add_rings(struct qlcnic_adapt= er *adapter) sds_mbx_size =3D sizeof(struct qlcnic_sds_mbx); context_id =3D recv_ctx->context_id; num_sds =3D adapter->drv_sds_rings - QLCNIC_MAX_SDS_RINGS; - ahw->hw_ops->alloc_mbx_args(&cmd, adapter, - QLCNIC_CMD_ADD_RCV_RINGS); + err =3D ahw->hw_ops->alloc_mbx_args(&cmd, adapter, + QLCNIC_CMD_ADD_RCV_RINGS); + if (err) { + dev_err(&adapter->pdev->dev, + "Failed to alloc mbx args %d\n", err); + return err; + } + cmd.req.arg[1] =3D 0 | (num_sds << 8) | (context_id << 16); =20 /* set up status rings, mbx 2-81 */ --=20 2.25.1