From patchwork Tue Apr 26 08:21:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 567801 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 7DDA3C4332F for ; Tue, 26 Apr 2022 09:08:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346654AbiDZJLG (ORCPT ); Tue, 26 Apr 2022 05:11:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233404AbiDZJGq (ORCPT ); Tue, 26 Apr 2022 05:06:46 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E7911738FB; Tue, 26 Apr 2022 01:48:12 -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 ACA9E60C43; Tue, 26 Apr 2022 08:48:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC4DFC385A4; Tue, 26 Apr 2022 08:48:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650962891; bh=jxHhvnBGUxwf1Vmi/IZkKa8gPWOhQqbc43zwD+FUAEI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qAeCewSfKdSFKsfva66Ws2bHC2OSL7q8tymml/OJCgUJBcXdKSgFjqsO5WNZ8Krli WqSPM2xQjtr3XXEcd5xbFuXgZa53IkiuM3bj7PcsmbCAM3rf2vXA2XHC7PwibsZBvq GqRJAIVyyI+bhByEOv4oto7fi2XRurnenGeSqA+U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Hutchinson , Dima Ruinskiy , Sasha Neftin , Naama Meir , Tony Nguyen Subject: [PATCH 5.17 123/146] e1000e: Fix possible overflow in LTR decoding Date: Tue, 26 Apr 2022 10:21:58 +0200 Message-Id: <20220426081753.514499464@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081750.051179617@linuxfoundation.org> References: <20220426081750.051179617@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Sasha Neftin commit 04ebaa1cfddae5f240cc7404f009133bb0389a47 upstream. When we decode the latency and the max_latency, u16 value may not fit the required size and could lead to the wrong LTR representation. Scaling is represented as: scale 0 - 1 (2^(5*0)) = 2^0 scale 1 - 32 (2^(5 *1))= 2^5 scale 2 - 1024 (2^(5 *2)) =2^10 scale 3 - 32768 (2^(5 *3)) =2^15 scale 4 - 1048576 (2^(5 *4)) = 2^20 scale 5 - 33554432 (2^(5 *4)) = 2^25 scale 4 and scale 5 required 20 and 25 bits respectively. scale 6 reserved. Replace the u16 type with the u32 type and allow corrected LTR representation. Cc: stable@vger.kernel.org Fixes: 44a13a5d99c7 ("e1000e: Fix the max snoop/no-snoop latency for 10M") Reported-by: James Hutchinson Link: https://bugzilla.kernel.org/show_bug.cgi?id=215689 Suggested-by: Dima Ruinskiy Signed-off-by: Sasha Neftin Tested-by: Naama Meir Tested-by: James Hutchinson Signed-off-by: Tony Nguyen Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/intel/e1000e/ich8lan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c @@ -1009,8 +1009,8 @@ static s32 e1000_platform_pm_pch_lpt(str { u32 reg = link << (E1000_LTRV_REQ_SHIFT + E1000_LTRV_NOSNOOP_SHIFT) | link << E1000_LTRV_REQ_SHIFT | E1000_LTRV_SEND; - u16 max_ltr_enc_d = 0; /* maximum LTR decoded by platform */ - u16 lat_enc_d = 0; /* latency decoded */ + u32 max_ltr_enc_d = 0; /* maximum LTR decoded by platform */ + u32 lat_enc_d = 0; /* latency decoded */ u16 lat_enc = 0; /* latency encoded */ if (link) {