This is a note to let you know that I've just added the patch titled
ALSA: control: Make sure that id->index does not overflow
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-control-make-sure-that-id-index-does-not-overflow.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 883a1d49f0d77d30012f114b2e19fc141beb3e8e Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
Date: Wed, 18 Jun 2014 13:32:35 +0200
Subject: ALSA: control: Make sure that id->index does not overflow
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
commit 883a1d49f0d77d30012f114b2e19fc141beb3e8e upstream.
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@xxxxxxxxxx>
Acked-by: Jaroslav Kysela <perex@xxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/control.c | 3 +++
1 file changed, 3 insertions(+)
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -342,6 +342,9 @@ int snd_ctl_add(struct snd_card *card, s
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);
Patches currently in stable-queue which might be from lars@xxxxxxxxxx are
queue-3.15/alsa-control-protect-user-controls-against-concurrent-access.patch
queue-3.15/asoc-dapm-make-sure-to-always-update-the-dapm-graph-in-_put_volsw.patch
queue-3.15/alsa-control-don-t-access-controls-outside-of-protected-regions.patch
queue-3.15/alsa-control-fix-replacing-user-controls.patch
queue-3.15/alsa-control-make-sure-that-id-index-does-not-overflow.patch
queue-3.15/alsa-control-handle-numid-overflow.patch
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