From patchwork Mon Dec 28 12:46:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 353120 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, USER_AGENT_GIT autolearn=unavailable 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 BDAB6C4321A for ; Mon, 28 Dec 2020 16:12:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A09B6207C9 for ; Mon, 28 Dec 2020 16:12:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388211AbgL1NWV (ORCPT ); Mon, 28 Dec 2020 08:22:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:50142 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388095AbgL1NVg (ORCPT ); Mon, 28 Dec 2020 08:21:36 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id EBA25208BA; Mon, 28 Dec 2020 13:20:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609161655; bh=e+yxeZxMeAL9DiZyVGoWrKdVC3Kb41WnnxKacxxwxkA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WypNJuessSf6+KcUVb3YJ8a79Jak6Ic6kdaaYi2E4ql1mgbekSRAR11BLifZ7jGK1 NjVR3m6R2oKQPLmtjVLvj/b+UJ/GcuaggkCjkckMxeqs+Y3uahWMxdO9Ehgl+h9Ay2 SSUgjIaP/0uzcoThmzLJOZVObwQOy3xvhfz34B7A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai Subject: [PATCH 4.19 042/346] ALSA: usb-audio: Fix control access overflow errors from chmap Date: Mon, 28 Dec 2020 13:46:01 +0100 Message-Id: <20201228124921.822780571@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124919.745526410@linuxfoundation.org> References: <20201228124919.745526410@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Takashi Iwai commit c6dde8ffd071aea9d1ce64279178e470977b235c upstream. The current channel-map control implementation in USB-audio driver may lead to an error message like "control 3:0:0:Playback Channel Map:0: access overflow" when CONFIG_SND_CTL_VALIDATION is set. It's because the chmap get callback clears the whole array no matter which count is set, and rather the false-positive detection. This patch fixes the problem by clearing only the needed array range at usb_chmap_ctl_get(). Cc: Link: https://lore.kernel.org/r/20201211130048.6358-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/stream.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -198,16 +198,16 @@ static int usb_chmap_ctl_get(struct snd_ struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol); struct snd_usb_substream *subs = info->private_data; struct snd_pcm_chmap_elem *chmap = NULL; - int i; + int i = 0; - memset(ucontrol->value.integer.value, 0, - sizeof(ucontrol->value.integer.value)); if (subs->cur_audiofmt) chmap = subs->cur_audiofmt->chmap; if (chmap) { for (i = 0; i < chmap->channels; i++) ucontrol->value.integer.value[i] = chmap->map[i]; } + for (; i < subs->channels_max; i++) + ucontrol->value.integer.value[i] = 0; return 0; }