From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 071F3313539; Thu, 28 May 2026 19:53:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779998017; cv=none; b=ZaUyQJVtPMXL6OerQC0pyC5tPkswI2otfrGocBSL6X/ZjWDpSS16r+p9QITJdNp3/qf6ctdI9r/emvAEmMKKjixyeZp9nff+BGd2M8q7u3EwbmvATioTH5XfrZYRebtuSVZgwXA6lcqmbPf0vIj2hu1c7Z7LHoynP5vfvbEsk9o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779998017; c=relaxed/simple; bh=TYXMorCaAoJGJO4sDLv3zvEGc0aJfq/8H4/hfUsW7H4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mfzPhWDCzgnXiRNMxIuqt2gzzY7KLlI+QEgiHOOChRARgTc5WdUryS7LKqXvObWigzzUcXADaN3lLh4rAAJ50LhrzbU42HOjqBQ2nMjOmXjCPMH1d7+sUqaMkCTte29g1jjH5kHanm0fX1xn3mBGeSea6smQd85N/B1eRtzjT9k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uPNKb+8E; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="uPNKb+8E" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 310071F000E9; Thu, 28 May 2026 19:53:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779998015; bh=tMxDwubwYB5EuHtlmgwXSNEtwv3WQoTzZ5qmkpc1CTM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=uPNKb+8EbkS1Awz48ARX7+Be8X1ewAZyjqQ5udWIOydwcVd5mhnEgU4ohOI4f1xKU f557ncJO9QJM42MqKqE6Fn+0SVFiIcqCtI7DwdswxxuYHFs29cnOE80IlMTjXk4Evv 4+TgEEjNlo1M2pWxqMNE/D/Zl+jReG0IesYKgmGQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?C=C3=A1ssio=20Gabriel?= , Takashi Iwai Subject: [PATCH 7.0 023/461] ALSA: ua101: Reject too-short USB descriptors Date: Thu, 28 May 2026 21:42:32 +0200 Message-ID: <20260528194647.554578696@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260528194646.819809818@linuxfoundation.org> References: <20260528194646.819809818@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 7.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cássio Gabriel commit b59d5c51bb328a60749b4dd5fe7e649bfb4089b4 upstream. find_format_descriptor() walks the class-specific interface extras by advancing with bLength. It rejects descriptors that extend past the remaining buffer, but it does not reject descriptor lengths smaller than a USB descriptor header. Reject too-short descriptors before using bLength to advance the local scan. This keeps the UA-101 parser robust against malformed descriptor data and matches the usual USB descriptor walking rules. Fixes: 63978ab3e3e9 ("sound: add Edirol UA-101 support") Cc: stable@vger.kernel.org Signed-off-by: Cássio Gabriel Link: https://patch.msgid.link/20260519-alsa-ua101-desc-len-v1-1-4307d1a5e054@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/misc/ua101.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/sound/usb/misc/ua101.c +++ b/sound/usb/misc/ua101.c @@ -894,8 +894,9 @@ find_format_descriptor(struct usb_interf struct uac_format_type_i_discrete_descriptor *desc; desc = (struct uac_format_type_i_discrete_descriptor *)extra; - if (desc->bLength > extralen) { - dev_err(&interface->dev, "descriptor overflow\n"); + if (desc->bLength < sizeof(struct usb_descriptor_header) || + desc->bLength > extralen) { + dev_err(&interface->dev, "invalid descriptor length\n"); return NULL; } if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&