linux-kernel - Re: [PATCH 1/2] Fix an OOB bug in parse_audio_mixer

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Date:   Sun, 1 Sep 2019 14:58:09 +0200
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Hui Peng <benquike@...il.com>
Cc:     stable@...r.kernel.org,
        Mathias Payer <mathias.payer@...elwelt.net>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wenwen Wang <wang6495@....edu>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Fix an OOB bug in parse_audio_mixer_unit

On Fri, Aug 30, 2019 at 05:46:49PM -0400, Hui Peng wrote:
> The `uac_mixer_unit_descriptor` shown as below is read from the
> device side. In `parse_audio_mixer_unit`, `baSourceID` field is
> accessed from index 0 to `bNrInPins` - 1, the current implementation
> assumes that descriptor is always valid (the length  of descriptor
> is no shorter than 5 + `bNrInPins`). If a descriptor read from
> the device side is invalid, it may trigger out-of-bound memory
> access.
> 
> ```
> struct uac_mixer_unit_descriptor {
> 	__u8 bLength;
> 	__u8 bDescriptorType;
> 	__u8 bDescriptorSubtype;
> 	__u8 bUnitID;
> 	__u8 bNrInPins;
> 	__u8 baSourceID[];
> }
> ```
> 
> This patch fixes the bug by add a sanity check on the length of
> the descriptor.
> 
> CVE: CVE-2018-15117

FWIW, the correct CVE id should be probably CVE-2019-15117 here.

But there was already a patch queued and released in 5.2.10 and
4.19.68 for this issue (as far I can see; is this correct?)

Regards,
Salvatore