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Groups > linux.kernel > #1359338
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.19.y-ckt 31/70] ALSA: hdspm: Fix zero-division |
| Date | 2016-03-16 21:30 +0100 |
| Message-ID | <rdqeT-5tf-47@gated-at.bofh.it> (permalink) |
| References | <rdpVv-5jX-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
v3.19.8-ckt17 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Takashi Iwai <tiwai@suse.de>
commit c1099c3294c2344110085a38c50e478a5992b368 upstream.
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.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
sound/pci/rme9652/hdspm.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 5dadc78..5c14afa1 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -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)
@@ -2219,6 +2222,8 @@ 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;
}
}
@@ -2264,7 +2269,10 @@ 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;
}
--
2.7.0
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