[PATCH] alsa-ucm: disallow null mdev argument into pa_alsa_open_mixer_by_name()

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It's possible for mdev to be NULL. In this case, an assert is taken
in pa_alsa_open_mixer_by_name() with debug builds, and a crash with
release builds. However, it's possible to bypass this trouble by taking
the error path if mdev is NULL.

Reported-by: Jarkko Sankala <jarkko.sankala@xxxxxxxxxx>
Signed-off-by: Eero Nurkkala <eero.nurkkala@xxxxxxxxxx>
 src/modules/alsa/alsa-ucm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/modules/alsa/alsa-ucm.c b/src/modules/alsa/alsa-ucm.c
index 1dfb0e08b..295286555 100644
--- a/src/modules/alsa/alsa-ucm.c
+++ b/src/modules/alsa/alsa-ucm.c
@@ -942,7 +942,7 @@ static void probe_volumes(pa_hashmap *hash, bool is_sink, snd_pcm_t *pcm_handle,
             mdev = mdev2;
-        if (!(mixer_handle = pa_alsa_open_mixer_by_name(mixers, mdev, true))) {
+        if (mdev == NULL || !(mixer_handle = pa_alsa_open_mixer_by_name(mixers, mdev, true))) {
             pa_log_error("Failed to find a working mixer device (%s).", mdev);
             goto fail;

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