From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 25 Aug 2006 09:39:34 +0000 (+0200)
Subject: [ALSA] Return error if no user TLV is defined
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=18c1c3f694105ab2a6f43e054e23f9a751b2f869;p=openwrt%2Fstaging%2Fblogic.git

[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>
---

diff --git a/sound/core/control.c b/sound/core/control.c
index 3030aaa6d2c5..6973a9686b67 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -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))