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=-16.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D53A7C433E0 for ; Wed, 10 Feb 2021 21:29:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F47764ED3 for ; Wed, 10 Feb 2021 21:29:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233070AbhBJV3G (ORCPT ); Wed, 10 Feb 2021 16:29:06 -0500 Received: from mail.kernel.org ([198.145.29.99]:54718 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233298AbhBJVYP (ORCPT ); Wed, 10 Feb 2021 16:24:15 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8865A64E25; Wed, 10 Feb 2021 21:23:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1612992213; bh=k3bbAR+QQBOR7zd9whmQpQntZ79/acFM/RObzEoAatE=; h=Date:From:To:Cc:Subject:From; b=BqgEJkVCl0KGcfVOtXDwLivOod3poKWl51r6qsc1KvoGcbt2+SMFUVP7Pn33CoPtx 4BTBUxGWmk3jirdxVDFeqeLr0lYHm9c3MYOANm+2xiL4KBiSY7gseZEAIDdm92aSQ1 5NISc/OT1CVUYEmOJ5d2WHKsGYUDvC5QlSc7n7s/7+67IVg3k00gFYjyuDwA7lm5Gu 1dTeSOnBYXVLq2ZKlqalDU+mZOXAvb6TvObkSKCHqtR1MIxnvWsDkrkwWE/lEB7th0 6YSOov/V1LzFUuSQrmkQbr+mBDrX8YiAq9nUhn5/xJGwOOHYrevHtdMMxn0vZXoTgM cksH2GFNWTrpg== Date: Wed, 10 Feb 2021 15:23:30 -0600 From: "Gustavo A. R. Silva" To: Harry Wentland , Leo Li , Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , David Airlie , Daniel Vetter , Huang Rui , Anson Jacob , Lang Yu , Nicholas Kazlauskas Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH][next] drm/amd/display: Fix potential integer overflow Message-ID: <20210210212330.GA880153@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fix potential integer overflow by casting actual_calculated_clock_100hz to u64, in order to give the compiler complete information about the proper arithmetic to use. Notice that such variable is used in a context that expects an expression of type u64 (64 bits, unsigned) and the following expression is currently being evaluated using 32-bit arithmetic: actual_calculated_clock_100hz * post_divider Fixes: 7a03fdf628af ("drm/amd/display: fix 64bit division issue on 32bit OS") Addresses-Coverity-ID: 1501691 ("Unintentional integer overflow") Signed-off-by: Gustavo A. R. Silva --- drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c index bc942725b9d8..dec58b3c42e4 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c @@ -240,7 +240,7 @@ static bool calc_fb_divider_checking_tolerance( pll_settings->calculated_pix_clk_100hz = actual_calculated_clock_100hz; pll_settings->vco_freq = - div_u64(actual_calculated_clock_100hz * post_divider, 10); + div_u64((u64)actual_calculated_clock_100hz * post_divider, 10); return true; } return false; -- 2.27.0