linux-kernel - [PATCH v2] ASoC: Add a sanity check before using dai driver name

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Date:   Thu, 24 Aug 2017 11:34:11 +0800
From:   Jeffy Chen <jeffy.chen@...k-chips.com>
To:     linux-kernel@...r.kernel.org, broonie@...nel.org
Cc:     tiwai@...e.de, dolinux.peng@...il.com,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: [PATCH v2] ASoC: Add a sanity check before using dai driver name

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

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

Changes in v2:
Keep the oringinal check style.

 sound/soc/soc-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index fc1bb2da3e2e..c38c8f844546 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1029,7 +1029,8 @@ struct snd_soc_dai *snd_soc_find_dai(
 			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))
+			    && (!dai->driver->name
+				|| !strcmp(dai->driver->name, dlc->dai_name))
 				continue;
 
 			return dai;
-- 
2.11.0