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>

parent 164f73ee

sound/pci/hda/patch_realtek.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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)