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ALSA: control: Handle numid overflow

Each control gets automatically assigned its numids when the control is created.
The allocation is done by incrementing the numid by the amount of allocated
numids per allocation. This means that excessive creation and destruction of
controls (e.g. via SNDRV_CTL_IOCTL_ELEM_ADD/REMOVE) can cause the id to
eventually overflow. Currently when this happens for the control that caused the
overflow kctl->id.numid + kctl->count will also over flow causing it to be
smaller than kctl->id.numid. Most of the code assumes that this is something
that can not happen, so we need to make sure that it won't happen

Signed-off-by: Lars-Peter Clausen <>
Acked-by: Jaroslav Kysela <>
Cc: <>
Signed-off-by: Takashi Iwai <>
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larsclausen authored and tiwai committed Jun 18, 2014
1 parent fd9f26e commit ac902c112d90a89e59916f751c2745f4dbdbb4bd
Showing with 4 additions and 0 deletions.
  1. +4 −0 sound/core/control.c
@@ -288,6 +288,10 @@ static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
struct snd_kcontrol *kctl;

/* Make sure that the ids assigned to the control do not wrap around */
if (card->last_numid >= UINT_MAX - count)
card->last_numid = 0;

list_for_each_entry(kctl, &card->controls, list) {
if (kctl->id.numid < card->last_numid + 1 + count &&
kctl->id.numid + kctl->count > card->last_numid + 1) {

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