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[ALSA] Return error if no user TLV is defined 

Retrun error to user TLV_READ ioctl if no TLV is defined.
(Until now, nothing was written and rerunred successfully.)

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
hifive-unleashed-5.1
Takashi Iwai 2006-08-25 11:39:34 +02:00 committed by Jaroslav Kysela
parent 86148e84c2
commit 18c1c3f694
1 changed files with 2 additions and 0 deletions
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2
sound/core/control.c
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@ -951,6 +951,8 @@ static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
ue->tlv_data = new_data;
ue->tlv_data_size = size;
} else {
if (! ue->tlv_data_size || ! ue->tlv_data)
return -ENXIO;
if (size < ue->tlv_data_size)
return -ENOSPC;
if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))