[ 70/76] ALSA: hda - Always check array bounds in alc_get_line_out_pfx

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Henningsson <david.henningsson@canonical.com>

commit 71aa5ebe36a4e936eff281b375a4707b6a8320f2 upstream.

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.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/pci/hda/patch_realtek.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -2629,8 +2629,10 @@ static const char *alc_get_line_out_pfx(
 			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];
 }