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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 161E1C43464 for ; Fri, 18 Sep 2020 02:47:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF47A2075B for ; Fri, 18 Sep 2020 02:47:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600397249; bh=3DMF38mldNUYA7yCL5j6zamAk3sB0jOQDvUCBZLfLl4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=i4Gw6UIuIisr22IR/BXJNWcQfXruKfXAMiFvEIAgh/oRBnCvs3zODzLfHTUPtyE+q o/becZGv8ruz6/7nfZrsdQTpj+rec6ndJQ/UAoAIXKWDkgnHajNqCM9TbyOqnS8hGI DVOlG3VavNfYw13/F5xL6sGZ8kCcunQKVcfEo1pM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726721AbgIRCr2 (ORCPT ); Thu, 17 Sep 2020 22:47:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:33508 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728316AbgIRCJk (ORCPT ); Thu, 17 Sep 2020 22:09:40 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B52282399C; Fri, 18 Sep 2020 02:09:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600394980; bh=3DMF38mldNUYA7yCL5j6zamAk3sB0jOQDvUCBZLfLl4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E7gx+7BYnC04ED1FWpWz+eFOz0lE1lREsuqAW534Q+kYJ7kUqaqN4QdFO9YfxR0zE MZ0Ug8LrmQIt5leSevPchrLffSmSvpiW5PNhu2we+2qsPgh5yahDVFVsEVFFBbhSos Y0aVj2AUzzLWl/nFY+bQkpCu2UnFOo4DtFOGlhy0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Takashi Iwai , Sasha Levin , alsa-devel@alsa-project.org Subject: [PATCH AUTOSEL 4.19 080/206] ALSA: usb-audio: Don't create a mixer element with bogus volume range Date: Thu, 17 Sep 2020 22:05:56 -0400 Message-Id: <20200918020802.2065198-80-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020802.2065198-1-sashal@kernel.org> References: <20200918020802.2065198-1-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: Takashi Iwai [ Upstream commit e9a0ef0b5ddcbc0d56c65aefc0f18d16e6f71207 ] Some USB-audio descriptors provide a bogus volume range (e.g. volume min and max are identical), which confuses user-space. This patch makes the driver skipping such a control element. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206221 Link: https://lore.kernel.org/r/20200214144928.23628-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/mixer.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 45bd3d54be54b..451b8ea383c61 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1699,6 +1699,16 @@ static void __build_feature_ctl(struct usb_mixer_interface *mixer, /* get min/max values */ get_min_max_with_quirks(cval, 0, kctl); + /* skip a bogus volume range */ + if (cval->max <= cval->min) { + usb_audio_dbg(mixer->chip, + "[%d] FU [%s] skipped due to invalid volume\n", + cval->head.id, kctl->id.name); + snd_ctl_free_one(kctl); + return; + } + + if (control == UAC_FU_VOLUME) { check_mapped_dB(map, cval); if (cval->dBmin < cval->dBmax || !cval->initialized) { -- 2.25.1