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ALSA: hda - Always check array bounds in alc_get_line_out_pfx 

Even when CONFIG_SND_DEBUG is not enabled, we don't want to
return an arbitrary memory location when the channel count is
larger than we expected.

Cc: stable@kernel.org
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Henningsson 2012-10-17 12:43:44 +02:00 committed by Takashi Iwai
parent 1f04661fde
commit 71aa5ebe36
1 changed files with 3 additions and 1 deletions
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4
sound/pci/hda/patch_realtek.c
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@ -2598,8 +2598,10 @@ static const char *alc_get_line_out_pfx(struct alc_spec *spec, int ch,
return "PCM";
break;
}
if (snd_BUG_ON(ch >= ARRAY_SIZE(channel_name)))
if (ch >= ARRAY_SIZE(channel_name)) {
snd_BUG();
return "PCM";
}
return channel_name[ch];
}