From nobody Sat Feb 7 21:55:06 2026 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 1F29FC54EE9 for ; Tue, 13 Sep 2022 15:20:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235932AbiIMPUJ (ORCPT ); Tue, 13 Sep 2022 11:20:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235896AbiIMPSa (ORCPT ); Tue, 13 Sep 2022 11:18:30 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED094B55; Tue, 13 Sep 2022 07:35:14 -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 B061F614AA; Tue, 13 Sep 2022 14:35:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C7498C433D6; Tue, 13 Sep 2022 14:35:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1663079714; bh=sZQYElcGS/DOQWicjtPM/97X2vpvcYwfPlGU+gxOP9w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LmtAZTigs6ppO2dqeGd/fzazjWuriBCwRtIP2npJGJ1YvN1JSPAU0hI/UWcj80Qj4 n/hX3Xm861HxNhoeL9Nt4FCcCszNwATm8av044N8ZQqIBg2jTzgyaKElmmvvPq3xOD QpluW7p/PwPu1pdY07vXTE4hoQu/gb+ip4GwJFa8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dongxiang Ke , Takashi Iwai Subject: [PATCH 4.14 46/61] ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface() Date: Tue, 13 Sep 2022 16:07:48 +0200 Message-Id: <20220913140348.774214734@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220913140346.422813036@linuxfoundation.org> References: <20220913140346.422813036@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Dongxiang Ke commit e53f47f6c1a56d2af728909f1cb894da6b43d9bf upstream. There may be a bad USB audio device with a USB ID of (0x04fa, 0x4201) and the number of it's interfaces less than 4, an out-of-bounds read bug occurs when parsing the interface descriptor for this device. Fix this by checking the number of interfaces. Signed-off-by: Dongxiang Ke Link: https://lore.kernel.org/r/20220906024928.10951-1-kdx.glider@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -502,7 +502,7 @@ int snd_usb_parse_audio_interface(struct * Dallas DS4201 workaround: It presents 5 altsettings, but the last * one misses syncpipe, and does not produce any sound. */ - if (chip->usb_id =3D=3D USB_ID(0x04fa, 0x4201)) + if (chip->usb_id =3D=3D USB_ID(0x04fa, 0x4201) && num >=3D 4) num =3D 4; =20 for (i =3D 0; i < num; i++) {