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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>
This commit is contained in:
Takashi Iwai 2011-12-02 15:29:12 +01:00
parent fc084e0b93
commit cce4aa378a
1 changed files with 2 additions and 0 deletions
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2
sound/pci/hda/patch_realtek.c
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@ -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;