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Commit c1099c32 authored by Takashi Iwai's avatar Takashi Iwai
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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: default avatarTakashi Iwai <tiwai@suse.de>
parent 537e4813

sound/pci/rme9652/hdspm.c

+8 −0
Original line number Diff line number Diff line
@@ -1601,6 +1601,9 @@ static void hdspm_set_dds_value(struct hdspm *hdspm, int rate) 
{

	u64 n;



	if (snd_BUG_ON(rate <= 0))

		return;



	if (rate >= 112000)

		rate /= 4;

	else if (rate >= 56000)
@@ -2215,6 +2218,8 @@ static int hdspm_get_system_sample_rate(struct hdspm *hdspm) 
		} else {

			/* slave mode, return external sample rate */

			rate = hdspm_external_sample_rate(hdspm);

			if (!rate)

				rate = hdspm->system_sample_rate;

		}

	}
@@ -2260,7 +2265,10 @@ static int snd_hdspm_put_system_sample_rate(struct snd_kcontrol *kcontrol, 
					    ucontrol)

{

	struct hdspm *hdspm = snd_kcontrol_chip(kcontrol);

	int rate = ucontrol->value.integer.value[0];



	if (rate < 27000 || rate > 207000)

		return -EINVAL;

	hdspm_set_dds_value(hdspm, ucontrol->value.integer.value[0]);

	return 0;

}