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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 BCAB2C433F5 for ; Tue, 7 Sep 2021 14:12:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1F98610E9 for ; Tue, 7 Sep 2021 14:12:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229650AbhIGONY (ORCPT ); Tue, 7 Sep 2021 10:13:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38932 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233642AbhIGONX (ORCPT ); Tue, 7 Sep 2021 10:13:23 -0400 Received: from mail-ed1-x52c.google.com (mail-ed1-x52c.google.com [IPv6:2a00:1450:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E5E2C061575 for ; Tue, 7 Sep 2021 07:12:17 -0700 (PDT) Received: by mail-ed1-x52c.google.com with SMTP id s25so14194606edw.0 for ; Tue, 07 Sep 2021 07:12:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=zmHBk46/gYZI1Bt0Lz6xKWjU/HioQ2nyjhMLj4gtxKg=; b=TqVukg8uxIdZcnIhrSi/ap3SVKObidt/LjZo5GokAiqdvyWT/7/s37Klyyqek0fNqw g+DS7SfGCDu6RewGBAZo7bEVOPTBNatn2MzGYcfKKkkoSCfXE+9v8gknokfm6qnlsouL uLgRUWS66OJwg8JwkVOHYLBscJlMGPghhuTeQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=zmHBk46/gYZI1Bt0Lz6xKWjU/HioQ2nyjhMLj4gtxKg=; b=oBGh4t1tVt5QtrZTpbIGg2569/4Lpd4mdGXFdvcqR3rCbZxK5+h9ceB/Mv7ygyqQIG yTa2mU8Ck8ECE44rD6NMHSNZI6inRWysE4biBYANYNNkLIctIKuDwL9GdYvQRE1V3eFq yjcTh7nNwNRQHO9Mp9geSOs9koyOBhaYxQPqdalArefhZ7YEgLfTGFI9Pp8fp9Uxvo1+ cynuKWShue4h4WT3vTGEnLGk+KLYXxSKoV6QjYJXURdtI5mSwOiqQNZFTQqhamCFPx3O tHTtixCLz9ZNleOe68bMC3NDji2qdY1LHa91VGG7vEM0pcvMqzyViS4o/5tDynj0erbY qGOA== X-Gm-Message-State: AOAM530oVQ1vMfIAred+Tfl2YT2GGpsqlGeHQGqInzIYtYZrnb7ZOVmy JgY6ejOqdsVj3C75lBED3lqXARtcQpuo5eMlvvWvZw== X-Google-Smtp-Source: ABdhPJyEWcW/caxnL4kTvdHDS+45FF3fHWSPqWbeYWXqXDjl+CF8AKyOy1ogt/mxTktA5vVNYYj59gZmlnh31/ODHSE= X-Received: by 2002:aa7:c311:: with SMTP id l17mr18486326edq.320.1631023935434; Tue, 07 Sep 2021 07:12:15 -0700 (PDT) MIME-Version: 1.0 References: <20210905081812.17113-1-len.baker@gmx.com> In-Reply-To: From: Selvin Xavier Date: Tue, 7 Sep 2021 19:42:03 +0530 Message-ID: Subject: Re: [PATCH] RDMA/bnxt_re: Prefer kcalloc over open coded arithmetic To: Leon Romanovsky Cc: Len Baker , Naresh Kumar PBS , Doug Ledford , Jason Gunthorpe , Kees Cook , linux-rdma@vger.kernel.org, linux-hardening@vger.kernel.org, linux-kernel Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000508a7b05cb685ad7" Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org --000000000000508a7b05cb685ad7 Content-Type: text/plain; charset="UTF-8" On Sun, Sep 5, 2021 at 3:51 PM Leon Romanovsky wrote: > > On Sun, Sep 05, 2021 at 10:18:12AM +0200, Len Baker wrote: > > As noted in the "Deprecated Interfaces, Language Features, Attributes, > > and Conventions" documentation [1], size calculations (especially > > multiplication) should not be performed in memory allocator (or similar) > > function arguments due to the risk of them overflowing. This could lead > > to values wrapping around and a smaller allocation being made than the > > caller was expecting. Using those allocations could lead to linear > > overflows of heap memory and other misbehaviors. > > > > In this case this is not actually dynamic sizes: both sides of the > > multiplication are constant values. However it is best to refactor this > > anyway, just to keep the open-coded math idiom out of code. > > > > So, use the purpose specific kcalloc() function instead of the argument > > size * count in the kzalloc() function. > > > > Also, remove the unnecessary initialization of the sqp_tbl variable > > since it is set a few lines later. > > > > [1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments > > > > Signed-off-by: Len Baker > > --- > > drivers/infiniband/hw/bnxt_re/ib_verbs.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > Thanks, > Reviewed-by: Leon Romanovsky Acked-by: Selvin Xavier --000000000000508a7b05cb685ad7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQfAYJKoZIhvcNAQcCoIIQbTCCEGkCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg 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