linux-kernel - [ 07/48] ALSA: control: Make sure that id->index does not

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Date:	Sun, 16 Nov 2014 22:53:35 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Willy Tarreau <w@....eu>
Subject: [ 07/48] ALSA: control: Make sure that id->index does not

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
 overflow

From: Lars-Peter Clausen <lars@...afoo.de>

The ALSA control code expects that the range of assigned indices to a control is
continuous and does not overflow. Currently there are no checks to enforce this.
If a control with a overflowing index range is created that control becomes
effectively inaccessible and unremovable since snd_ctl_find_id() will not be
able to find it. This patch adds a check that makes sure that controls with a
overflowing index range can not be created.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Acked-by: Jaroslav Kysela <perex@...ex.cz>
Cc: <stable@...r.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
(cherry picked from commit 883a1d49f0d77d30012f114b2e19fc141beb3e8e)
[wt: part 1 of CVE-2014-4656 fix]
Signed-off-by: Willy Tarreau <w@....eu>
---
 sound/core/control.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/core/control.c b/sound/core/control.c
index 7834a54..80bb3ed 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -328,6 +328,9 @@ int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
 	if (snd_BUG_ON(!card || !kcontrol->info))
 		goto error;
 	id = kcontrol->id;
+	if (id.index > UINT_MAX - kcontrol->count)
+		goto error;
+
 	down_write(&card->controls_rwsem);
 	if (snd_ctl_find_id(card, &id)) {
 		up_write(&card->controls_rwsem);
-- 
1.7.12.2.21.g234cd45.dirty



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