[PATCH 2/2] ALSA: hda/conexant: Add NULL check for dc_mode_path

[wangdich9700@163.com]

From: wangdicheng <wangdicheng@kylinos.cn>

snd_hda_add_new_path() returns NULL when no path exists between the
given NIDs, but olpc_xo_update_mic_pins() passes dc_mode_path
straight to snd_hda_activate_path() which dereferences it without
checking. Add the missing NULL guards, same as the local path
variable already has in the same function.

Signed-off-by: wangdicheng <wangdicheng@kylinos.cn>
---
 sound/hda/codecs/conexant.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/hda/codecs/conexant.c b/sound/hda/codecs/conexant.c
index e7a2a073d22c..880fbbe5b643 100644
--- a/sound/hda/codecs/conexant.c
+++ b/sound/hda/codecs/conexant.c
@@ -451,7 +451,8 @@ static void olpc_xo_update_mic_pins(struct hda_codec *codec)
 	if (!spec->dc_enable) {
 		/* disable DC bias path and pin for port F */
 		update_mic_pin(codec, 0x1e, 0);
-		snd_hda_activate_path(codec, spec->dc_mode_path, false, false);
+		if (spec->dc_mode_path)
+			snd_hda_activate_path(codec, spec->dc_mode_path, false, false);
 
 		/* update port B (ext mic) and C (int mic) */
 		/* OLPC defers mic widget control until when capture is
@@ -487,7 +488,8 @@ static void olpc_xo_update_mic_pins(struct hda_codec *codec)
 		update_mic_pin(codec, 0x1b, 0);
 		/* enable DC bias path and pin */
 		update_mic_pin(codec, 0x1e, spec->recording ? PIN_IN : 0);
-		snd_hda_activate_path(codec, spec->dc_mode_path, true, false);
+		if (spec->dc_mode_path)
+			snd_hda_activate_path(codec, spec->dc_mode_path, true, false);
 	}
 }
 
-- 
2.25.1