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ALSA: hda - Fix possible zero-division 

Check the TLV db scale result before actually dividing in vmaster
slave init code.  Also mask TLV_DB_SCALE_MUTE bit so that the right
value is obtained even if this bit is set by the codec driver.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2013-11-04 15:44:09 +01:00
parent 504333df8b
commit a4e7a12168
1 changed files with 7 additions and 2 deletions
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9
sound/pci/hda/hda_codec.c
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@ -2676,8 +2676,13 @@ static int get_kctl_0dB_offset(struct snd_kcontrol *kctl)
set_fs(fs);
} else if (kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)
tlv = kctl->tlv.p;
if (tlv && tlv[0] == SNDRV_CTL_TLVT_DB_SCALE)
val = -tlv[2] / tlv[3];
if (tlv && tlv[0] == SNDRV_CTL_TLVT_DB_SCALE) {
int step = tlv[3];
step &= ~TLV_DB_SCALE_MUTE;
if (!step)
return -1;
val = -tlv[2] / step;
}
return val;
}