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alsa-util: don't crash on devices with more than 32 channels

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The pa_channel_map_init_extend() call later in the function crashes if
if ss->channels is greater than PA_CHANNELS_MAX.

Reported here:
https://lists.freedesktop.org/archives/pulseaudio-discuss/2017-January/027404.html

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Tested-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
This commit is contained in:
Tanu Kaskinen 2017-01-28 18:08:24 +02:00
parent 539371b3f7
commit ca6c3f80f5
1 changed files with 7 additions and 0 deletions
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7
src/modules/alsa/alsa-util.c
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@ -747,6 +747,13 @@ snd_pcm_t *pa_alsa_open_by_device_string(
goto fail;
}
if (ss->channels > PA_CHANNELS_MAX) {
pa_log("Device %s has %u channels, but PulseAudio supports only %u channels. Unable to use the device.",
d, ss->channels, PA_CHANNELS_MAX);
snd_pcm_close(pcm_handle);
goto fail;
}
if (dev)
*dev = d;
else