linux-kernel - [PATCH 3.16 008/202] ALSA: usb-audio: Fix an out-of-bound read in create_composite

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Message-ID: <lsq.1556377989.548229562@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Hui Peng" <benquike@....com>, "Takashi Iwai" <tiwai@...e.de>
Subject: [PATCH 3.16 008/202] ALSA: usb-audio: Fix an out-of-bound read in
 create_composite_quirks

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hui Peng <benquike@....com>

commit cbb2ebf70daf7f7d97d3811a2ff8e39655b8c184 upstream.

In `create_composite_quirk`, the terminating condition of for loops is
`quirk->ifnum < 0`. So any composite quirks should end with `struct
snd_usb_audio_quirk` object with ifnum < 0.

    for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {

    	.....
    }

the data field of Bower's & Wilkins PX headphones usb device device quirks
do not end with {.ifnum = -1}, wihch may result in out-of-bound read.

This Patch fix the bug by adding an ending quirk object.

Fixes: 240a8af929c7 ("ALSA: usb-audio: Add a quirck for B&W PX headphones")
Signed-off-by: Hui Peng <benquike@....com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/usb/quirks-table.h | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3304,6 +3304,12 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge
 					}
 				}
 			},
+			{
+				.ifnum = -1
+			},
+			{
+				.ifnum = -1
+			},
 		}
 	}
 },