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>
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@ -2676,8 +2676,13 @@ static int get_kctl_0dB_offset(struct snd_kcontrol *kctl)
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set_fs(fs);
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} else if (kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)
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tlv = kctl->tlv.p;
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if (tlv && tlv[0] == SNDRV_CTL_TLVT_DB_SCALE)
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val = -tlv[2] / tlv[3];
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if (tlv && tlv[0] == SNDRV_CTL_TLVT_DB_SCALE) {
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int step = tlv[3];
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step &= ~TLV_DB_SCALE_MUTE;
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if (!step)
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return -1;
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val = -tlv[2] / step;
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}
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return val;
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}
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