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ALSA: hda/realtek - Fix possible Oops with NULL input_mux 

When BIOS is damn crazy and gives no pin-config at all, the driver might
lead to a NULL dereference.  Let's add a NULL check for such a case.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-02-21 11:59:45 +01:00
parent 164f73ee93
commit 5803a32646
1 changed files with 3 additions and 0 deletions
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3
sound/pci/hda/patch_realtek.c
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@ -302,6 +302,9 @@ static int alc_mux_select(struct hda_codec *codec, unsigned int adc_idx,
int i, type, num_conns;
hda_nid_t nid;
if (!spec->input_mux)
return 0;
mux_idx = adc_idx >= spec->num_mux_defs ? 0 : adc_idx;
imux = &spec->input_mux[mux_idx];
if (!imux->num_items && mux_idx > 0)