diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2014-06-18 13:32:35 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-07-11 13:33:52 +0100 |
| commit | f7500568b7633324e7c4282bb8baa3ff3f17fd7a (patch) | |
| tree | 9334f26a4f5d48269031a95c8b1a6a5d4d7ee70d | |
| parent | e3ca27c942102af152aabb2d2a4ab5fa0abe7d95 (diff) | |
ALSA: control: Make sure that id->index does not overflow
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@metafoo.de>
Acked-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | sound/core/control.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/core/control.c b/sound/core/control.c index d3f17deecf0c..92105946dcfc 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -341,6 +341,9 @@ 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); |