[PATCH] ASoC: Add a sanity check before using dai driver name

[Jeffy Chen <jeffy.chen@rock-chips.com>]

The dai driver's name is allowed to be NULL. So add a sanity check for
that.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reported-by: Donglin Peng <dolinux.peng@gmail.com>
---

 sound/soc/soc-core.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 77e7e2a11af0..8ab9ee2b460a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -978,11 +978,13 @@ struct snd_soc_dai *snd_soc_find_dai(
 		if (dlc->name && strcmp(component->name, dlc->name))
 			continue;
 		list_for_each_entry(dai, &component->dai_list, list) {
-			if (dlc->dai_name && strcmp(dai->name, dlc->dai_name)
-			    && strcmp(dai->driver->name, dlc->dai_name))
-				continue;
-
-			return dai;
+			if (!dlc->dai_name)
+				return dai;
+			if (!strcmp(dai->name, dlc->dai_name))
+				return dai;
+			if (dai->driver->name &&
+			    !strcmp(dai->driver->name, dlc->dai_name))
+				return dai;
 		}
 	}
 
-- 
2.11.0