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 9FA44C4320A for ; Thu, 19 Aug 2021 19:53:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8916761051 for ; Thu, 19 Aug 2021 19:53:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233792AbhHSTxn (ORCPT ); Thu, 19 Aug 2021 15:53:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34716 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234748AbhHSTxj (ORCPT ); Thu, 19 Aug 2021 15:53:39 -0400 Received: from mail-ed1-x532.google.com (mail-ed1-x532.google.com [IPv6:2a00:1450:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39DCFC061575; Thu, 19 Aug 2021 12:53:02 -0700 (PDT) Received: by mail-ed1-x532.google.com with SMTP id n12so10492101edx.8; Thu, 19 Aug 2021 12:53:02 -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=TL02EH4U27OoNA/U0vdcgLaKOgzicMCVSFoibIBTSqY=; b=jegj1+iUV+OYa0nLxvTj8NqDQWtDg+bVCVX/DXeMAqEepPR42MGZkvVHLwn/bsF7o8 0e/iFwkWNoFB7tiBlX4gsUPZ3e+LxJjTo/yuGB6rTdbqw7ng8Y9M6wiASMKpBp5D5OHx Q+Yyvae20b8s+yvBCiGI48BhNTZi+LScYkgy0To/a30BCJljhtLiWWjGYOkZqgQzmAmz niAPmGz+MG5ffgMp6bDJGMqraAeh8D94+A2PEeXKI9gaAv1eSTqAhmc1y1XPwxYnRnrd Cz1d6Yw1a9YeFSimnDEJJIQr6X+674A9QgQVt60mD4cdt9pUJWLD1ng4AThWGEgfjumn 4r2g== 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=TL02EH4U27OoNA/U0vdcgLaKOgzicMCVSFoibIBTSqY=; b=Su2YYsYttvPgWuKdnjvD+7uCBryXxlefrioVtIrex7eaowPtwsYK4jaBaoFhpk65Aj KZTdrbSrXoN3Z1MUfd5UARl+CiCIxQGzK/BERgP5jonnZUH0LMEesrZ2Ay+o37vlenn2 jJX+FDWCGP8mfcrf0UaeBo1osweR+nbqqhbesAcGAQbIDMlX1z0QtCtCEr1VKpobrAD1 X+FtFrMmvTDbVz3wT99iUdhRJe/UD6Q7Fl7dv0Ld+tz+5pTEe5MfH8A+bTnAAFnCyVts x1zQTj1wMbED3FtNm/eWPfZRCjNn6RznuXCjG5uYjaWJRevYIABmn6QoJUuJZ652nQUk DvAA== X-Gm-Message-State: AOAM5304hjlgktDrnsGMO2vZ2T1ILQkov2OhTKbRbBnU9l7klrFqAzVC xxL4INaDbN2w3/nkgaCOtHM= X-Google-Smtp-Source: ABdhPJx5c+3atR0akUSCvQH9yGfSDZgLsl3iVICHWV+CAbHlA79L62zT9M6X+mAZM5o/pFaAMkBIBw== X-Received: by 2002:a50:fc96:: with SMTP id f22mr18626056edq.367.1629402780891; Thu, 19 Aug 2021 12:53:00 -0700 (PDT) Received: from localhost.localdomain (185.239.71.98.16clouds.com. [185.239.71.98]) by smtp.gmail.com with ESMTPSA id ck17sm2284984edb.88.2021.08.19.12.52.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Aug 2021 12:53:00 -0700 (PDT) From: Xiaolong Huang To: mani@kernel.org, davem@davemloft.net, kuba@kernel.org Cc: linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Xiaolong Huang Subject: [RESEND PATCH] net: qrtr: fix another OOB Read in qrtr_endpoint_post Date: Fri, 20 Aug 2021 03:50:34 +0800 Message-Id: <20210819195034.632132-1-butterflyhuangxx@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This check was incomplete, did not consider size is 0: if (len != ALIGN(size, 4) + hdrlen) goto err; if size from qrtr_hdr is 0, the result of ALIGN(size, 4) will be 0, In case of len == hdrlen and size == 0 in header this check won't fail and if (cb->type == QRTR_TYPE_NEW_SERVER) { /* Remote node endpoint can bridge other distant nodes */ const struct qrtr_ctrl_pkt *pkt = data + hdrlen; qrtr_node_assign(node, le32_to_cpu(pkt->server.node)); } will also read out of bound from data, which is hdrlen allocated block. Fixes: 194ccc88297a ("net: qrtr: Support decoding incoming v2 packets") Fixes: ad9d24c9429e ("net: qrtr: fix OOB Read in qrtr_endpoint_post") Signed-off-by: Xiaolong Huang --- Reason for resend: 1. Modify the spelling error of signed-off-by email address. 2. Use real name. --- net/qrtr/qrtr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 171b7f3be6ef..0c30908628ba 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -493,7 +493,7 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) goto err; } - if (len != ALIGN(size, 4) + hdrlen) + if (!size || len != ALIGN(size, 4) + hdrlen) goto err; if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && -- 2.25.1