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 E3D8CC7EE2A for ; Mon, 1 May 2023 03:21:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233924AbjEADUg (ORCPT ); Sun, 30 Apr 2023 23:20:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44174 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234059AbjEADQk (ORCPT ); Sun, 30 Apr 2023 23:16:40 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BF9B46BE; Sun, 30 Apr 2023 20:07:32 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A205561889; Mon, 1 May 2023 03:06:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E24AAC433D2; Mon, 1 May 2023 03:06:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1682910406; bh=BR4psieaLe5m1WiFLrB14WfFWXXRVLIaoIjw3D6ekk0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nk2hiPwv0x7FFOAopa09Q4jGRqoNa8FcTnvt9czAzUqIgJU57b9N1aqUCDrWvWW94 iFjZN5bUTFvbyOhhjBgRDlL6V8qMTZSMPFes36ssMnhhq0d5fDgBshwkK4Wf3E/AW7 CJB+2fodCY+UPJNgEmACKm6Wr64CyiJ2+hpmwBtHfJhayvgWbN54Pccnf+TyGL8G/X g5YnGQpgjSyxLuYNjNuNbHHvMnSGyAtl9f23OQ7m6M/4eiP79970aqFuIx8vRZljNQ bAaSs73hey8Sl6DFXfrISl+uMZ1C4c60EneMZKZ88BNWiLMoAiCZF1zSYOF72JESkH +7IzTIPRJ9xMw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nur Hussein , Thierry Reding , Sasha Levin , thierry.reding@gmail.com, mperttunen@nvidia.com, airlied@gmail.com, daniel@ffwll.ch, jonathanh@nvidia.com, dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 6/9] drm/tegra: Avoid potential 32-bit integer overflow Date: Sun, 30 Apr 2023 23:06:28 -0400 Message-Id: <20230501030633.3255202-6-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230501030633.3255202-1-sashal@kernel.org> References: <20230501030633.3255202-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nur Hussein [ Upstream commit 2429b3c529da29d4277d519bd66d034842dcd70c ] In tegra_sor_compute_config(), the 32-bit value mode->clock is multiplied by 1000, and assigned to the u64 variable pclk. We can avoid a potential 32-bit integer overflow by casting mode->clock to u64 before we do the arithmetic and assignment. Signed-off-by: Nur Hussein Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin --- drivers/gpu/drm/tegra/sor.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c index 83108e2430501..adc191ec26a99 100644 --- a/drivers/gpu/drm/tegra/sor.c +++ b/drivers/gpu/drm/tegra/sor.c @@ -829,7 +829,7 @@ static int tegra_sor_compute_config(struct tegra_sor *sor, struct drm_dp_link *link) { const u64 f = 100000, link_rate = link->rate * 1000; - const u64 pclk = mode->clock * 1000; + const u64 pclk = (u64)mode->clock * 1000; u64 input, output, watermark, num; struct tegra_sor_params params; u32 num_syms_per_line; -- 2.39.2