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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45C78C77B7A for ; Tue, 6 Jun 2023 23:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240271AbjFFXOv (ORCPT ); Tue, 6 Jun 2023 19:14:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240217AbjFFXOe (ORCPT ); Tue, 6 Jun 2023 19:14:34 -0400 Received: from mail-qk1-x72e.google.com (mail-qk1-x72e.google.com [IPv6:2607:f8b0:4864:20::72e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7252C19A0 for ; Tue, 6 Jun 2023 16:14:27 -0700 (PDT) Received: by mail-qk1-x72e.google.com with SMTP id af79cd13be357-75d5051fad3so459497985a.3 for ; Tue, 06 Jun 2023 16:14:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1686093266; x=1688685266; h=mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=Y/bt+LEczbR9ZUUhvtsOE3sTva/F2otJWZaeIMwxWEk=; b=IcvpTxqz3X3uEzw7gAkqP2liMCfJ2uugzeIKp6t36GLVNCcdf6xV5178qrmEUAsyOX mLvx6qrqCfXcUN/hqyEGHOmAzXMv4b6GKoGR1aWaxPc9mrIvr9BAVVVv5Eis1QBj2qYb mif4GWt4gIjcabQYs+fXdHxksx8EP8zVHs2IY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686093266; x=1688685266; h=mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Y/bt+LEczbR9ZUUhvtsOE3sTva/F2otJWZaeIMwxWEk=; b=MzsmuL2J3jqemKM0SllD1LOOEMn2sMsQfwD3+EGqOrpApQviNBL+w9QmnyKsVrdPZB uikCiwHSomFBbLDk7IEtDxbevqgi13bWT95QHg0EdffUUmJd+FfiRx4wXGcF+GBqZOG4 2von6T7PLvyL17fAC6yutTf/2516cPWiX8r0jDprmDouM+fVn8mTp/5HjPfQOEp+T1wG 2Vbtd5loOO4KSwUjrvNTgxuIoyYZ4DY3t6MZ+7n5jCsfaQkLrxBLPNELVNI+HRr7zqxL j98C/R7V84NhuS2KgngoICvzm8UA2iWWy/glgHZ49TgiPeRbQkcZlw5+ylsVXxnCPF4q wN7Q== X-Gm-Message-State: AC+VfDxjYSXE86BmjhEMPO0qT/3nS5zoJ8C6rF9B4/Ke2AuZkdvBiJIg gcT72sd/YkdbSILO/amTfKB1h2bJYK1DTvi2Oh4= X-Google-Smtp-Source: ACHHUZ5OlfE/zg8Cp5ebXW1jsglUgsZt/1hdKsqlIBeJdNWn7TcE4RIUkynqISkt/NVg9DDu6NVzmg== X-Received: by 2002:a05:620a:6285:b0:75d:5446:3bff with SMTP id ov5-20020a05620a628500b0075d54463bffmr132327qkn.55.1686093266463; Tue, 06 Jun 2023 16:14:26 -0700 (PDT) Received: from ubuntu-22.localdomain ([192.19.222.250]) by smtp.gmail.com with ESMTPSA id x9-20020ae9e909000000b0075b23e55640sm5221519qkf.123.2023.06.06.16.14.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jun 2023 16:14:25 -0700 (PDT) From: William Zhang To: Broadcom Kernel List , Linux MTD List Cc: f.fainelli@gmail.com, rafal@milecki.pl, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, computersforpeace@gmail.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, William Zhang , Florian Fainelli , Miquel Raynal , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Kamal Dasu Subject: [PATCH 04/12] mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write Date: Tue, 6 Jun 2023 16:12:44 -0700 Message-Id: <20230606231252.94838-5-william.zhang@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230606231252.94838-1-william.zhang@broadcom.com> References: <20230606231252.94838-1-william.zhang@broadcom.com> MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000003911eb05fd7e2e21" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000003911eb05fd7e2e21 Content-Transfer-Encoding: 8bit When the oob buffer length is not in multiple of words, the oob write function does out-of-bounds read on the oob source buffer at the last iteration. Fix that by always checking length limit on the oob buffer read and fill with 0xff when reaching the end of the buffer to the oob registers. Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller") Signed-off-by: William Zhang Reviewed-by: Florian Fainelli --- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c index 20832857c4aa..d920e88c7f5b 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -1486,10 +1486,10 @@ static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i, for (j = 0; j < tbytes; j += 4) oob_reg_write(ctrl, j, - (oob[j + 0] << 24) | - (oob[j + 1] << 16) | - (oob[j + 2] << 8) | - (oob[j + 3] << 0)); + (((j < tbytes) ? oob[j] : 0xff) << 24) | + (((j + 1 < tbytes) ? oob[j + 1] : 0xff) << 16) | + (((j + 2 < tbytes) ? oob[j + 2] : 0xff) << 8) | + ((j + 3 < tbytes) ? oob[j + 3] : 0xff)); return tbytes; } -- 2.37.3 --0000000000003911eb05fd7e2e21 Content-Type: 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