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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 1A42BC07E85 for ; Tue, 11 Dec 2018 15:44:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D598E2086D for ; Tue, 11 Dec 2018 15:44:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543099; bh=XsMkTJEhUoqn9xe3ym851uJYgL6RtMGMIIDdxfttD4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tWnvaGxnKkvVwWtACl3ZYvqGR5ljxx/umfNWaQsYlWkaAeujpAjokYuwdSdFVQBP3 maVeVW3hI1i1BbWb86u8RBszTZcyTra9Rvg57wd2w1CRawlhUK4l0xjPoEtnaZwOB/ BHWLS58M0gQLVwM4U07ZBbVFEg27CaMAPnFS+hGk= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D598E2086D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727978AbeLKPo5 (ORCPT ); Tue, 11 Dec 2018 10:44:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:33318 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727480AbeLKPoz (ORCPT ); Tue, 11 Dec 2018 10:44:55 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D353C20855; Tue, 11 Dec 2018 15:44:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543095; bh=XsMkTJEhUoqn9xe3ym851uJYgL6RtMGMIIDdxfttD4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kku4kDk6pchq5FVAqoYR1frnOyK8GFZvHqTAzqb7yk1C4u9yPTEZaOFbDejAwyTEN fphV9zDvkv9x77Kt0CDgK8Ajv4zWwiv1QZXmdd43obWTa4XSZ/8usHCW5ttoFAIUgV lt3P20V8NuA2Pkf7KCwGcQg84f2tjjgEBi0434GA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai , Meelis Roos Subject: [PATCH 4.4 11/91] ALSA: ac97: Fix incorrect bit shift at AC97-SPSA control write Date: Tue, 11 Dec 2018 16:40:30 +0100 Message-Id: <20181211151606.866571820@linuxfoundation.org> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20181211151606.026852373@linuxfoundation.org> References: <20181211151606.026852373@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 7194eda1ba0872d917faf3b322540b4f57f11ba5 upstream. The function snd_ac97_put_spsa() gets the bit shift value from the associated private_value, but it extracts too much; the current code extracts 8 bit values in bits 8-15, but this is a combination of two nibbles (bits 8-11 and bits 12-15) for left and right shifts. Due to the incorrect bits extraction, the actual shift may go beyond the 32bit value, as spotted recently by UBSAN check: UBSAN: Undefined behaviour in sound/pci/ac97/ac97_codec.c:836:7 shift exponent 68 is too large for 32-bit type 'int' This patch fixes the shift value extraction by masking the properly with 0x0f instead of 0xff. Reported-and-tested-by: Meelis Roos Cc: Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/pci/ac97/ac97_codec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/sound/pci/ac97/ac97_codec.c +++ b/sound/pci/ac97/ac97_codec.c @@ -824,7 +824,7 @@ static int snd_ac97_put_spsa(struct snd_ { struct snd_ac97 *ac97 = snd_kcontrol_chip(kcontrol); int reg = kcontrol->private_value & 0xff; - int shift = (kcontrol->private_value >> 8) & 0xff; + int shift = (kcontrol->private_value >> 8) & 0x0f; int mask = (kcontrol->private_value >> 16) & 0xff; // int invert = (kcontrol->private_value >> 24) & 0xff; unsigned short value, old, new;