ALSA: hdspm: Fix zero-division
HDSPM driver contains a code issuing zero-division potentially in system sample rate ctl code. This patch fixes it by not processing a zero or invalid rate value as a divisor, as well as excluding the invalid value to be passed via the given ctl element. Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -1601,6 +1601,9 @@ static void hdspm_set_dds_value(struct hdspm *hdspm, int rate)
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{
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u64 n;
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if (snd_BUG_ON(rate <= 0))
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return;
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if (rate >= 112000)
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rate /= 4;
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else if (rate >= 56000)
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@ -2215,6 +2218,8 @@ static int hdspm_get_system_sample_rate(struct hdspm *hdspm)
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} else {
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/* slave mode, return external sample rate */
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rate = hdspm_external_sample_rate(hdspm);
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if (!rate)
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rate = hdspm->system_sample_rate;
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}
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}
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@ -2260,7 +2265,10 @@ static int snd_hdspm_put_system_sample_rate(struct snd_kcontrol *kcontrol,
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ucontrol)
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{
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struct hdspm *hdspm = snd_kcontrol_chip(kcontrol);
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int rate = ucontrol->value.integer.value[0];
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if (rate < 27000 || rate > 207000)
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return -EINVAL;
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hdspm_set_dds_value(hdspm, ucontrol->value.integer.value[0]);
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return 0;
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}
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