From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 2 Dec 2011 14:29:12 +0000 (+0100)
Subject: ALSA: hda/realtek - Fix Oops in alc_mux_select()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cce4aa378a049f4275416ee6302dd24f37b289df;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

ALSA: hda/realtek - Fix Oops in alc_mux_select()

When no imux is available (e.g. a single capture source),
alc_auto_init_input_src() may trigger an Oops due to the access to -1.
Add a proper zero-check to avoid it.

Cc: <stable@kernel.org>
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 cbde019d3d52..a7d1bc4e0d09 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -297,6 +297,8 @@ static int alc_mux_select(struct hda_codec *codec, unsigned int adc_idx,
 	imux = &spec->input_mux[mux_idx];
 	if (!imux->num_items && mux_idx > 0)
 		imux = &spec->input_mux[0];
+	if (!imux->num_items)
+		return 0;
 
 	if (idx >= imux->num_items)
 		idx = imux->num_items - 1;