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 76E5DECAAD8 for ; Tue, 20 Sep 2022 06:19:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230320AbiITGTY (ORCPT ); Tue, 20 Sep 2022 02:19:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229624AbiITGTX (ORCPT ); Tue, 20 Sep 2022 02:19:23 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5318E5D11E; Mon, 19 Sep 2022 23:19:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663654762; x=1695190762; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=eOSxHA6iENpubJOOFWN6159mbYl+bwBtFFHrUgRk8N4=; b=a9sE3D+Nslp2dmT9/BAltx3wnIt5/bIKQb+tSm9B0UViCusTyY0XSJlG 6jup6X9CrCgMFRNwIIueAms2ztIuyyy3mcewHsjQZvtjMjY/sfTA0Dx74 zFU9j8aYzQ0QzLsKQJEvHVhPy+OxNlb5qsr94cIkQnJxL71m41hfcB07J t9/V+mZoUTxaDEV8mgkTHZIQV1T3yM1EINJpK3hb4+tL0GRg5tK7lGnmF 7OHCs0yydXvPX1LvdWghtV6x6sv+/BQda5iCprGWVW1ZsMHvfoWYIjRZ0 /x122kFUJf//rWIQ9A5yzvEtH9IxHe1PQmRFptxXrfwyNXchfIeNKWZi+ A==; X-IronPort-AV: E=McAfee;i="6500,9779,10475"; a="325909657" X-IronPort-AV: E=Sophos;i="5.93,329,1654585200"; d="scan'208";a="325909657" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Sep 2022 23:19:21 -0700 X-IronPort-AV: E=Sophos;i="5.93,329,1654585200"; d="scan'208";a="794137755" Received: from sysdebug.bj.intel.com ([10.240.193.70]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Sep 2022 23:19:19 -0700 From: chao.qin@intel.com To: rafael@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: paul.mei@intel.com, lili.li@intel.com, chao.qin@intel.com Subject: [PATCH] powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue Date: Tue, 20 Sep 2022 14:08:26 +0800 Message-Id: <20220920060826.3631210-1-chao.qin@intel.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-pm@vger.kernel.org From: Chao Qin When value < time_unit, the parameter of ilog2() will be zero and the return value is -1. u64(-1) is too large for shift exponent and then will trigger shift-out-of-bounds: shift exponent 18446744073709551615 is too large for 32-bit type 'int' Call Trace: rapl_compute_time_window_core rapl_write_data_raw set_time_window store_constraint_time_window_us Signed-off-by: Chao Qin Acked-by: Zhang Rui --- drivers/powercap/intel_rapl_common.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c index 21d624f9f5fb..bf91248630c3 100644 --- a/drivers/powercap/intel_rapl_common.c +++ b/drivers/powercap/intel_rapl_common.c @@ -994,6 +994,9 @@ static u64 rapl_compute_time_window_core(struct rapl_package *rp, u64 value, y = value & 0x1f; value = (1 << y) * (4 + f) * rp->time_unit / 4; } else { + if (value < rp->time_unit) + return 0; + do_div(value, rp->time_unit); y = ilog2(value); f = div64_u64(4 * (value - (1 << y)), 1 << y); -- 2.25.1