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>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 8253b4eeb6a1bea0687675e8ac66ca41b9a84758..48d9d609f89b06bca17210b8ca9dfaec2a600c1d 100644 (file)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -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];
 }