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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 <firstname.lastname@example.org> Acked-by: Jaroslav Kysela <email@example.com> Cc: <firstname.lastname@example.org> Signed-off-by: Takashi Iwai <email@example.com>
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