linux-kernel - [PATCH] ASoC: dapm: Do not traverse widget hooks to snd-soc-dummy

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Date:	Wed, 16 Mar 2016 19:17:51 +0800
From:	Harry Pan <harry.pan@...el.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Harry Pan <gs0622@...il.com>, Harry Pan <harry.pan@...el.com>,
	lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
	tiwai@...e.com, alsa-devel@...a-project.org
Subject: [PATCH] ASoC: dapm: Do not traverse widget hooks to snd-soc-dummy

All components are initially given an empty card when registering platform,
and since the commit 6e78108bda78
("ASoC: core: Don't probe the component which is dummy")',
snd-soc-dummy will not be probed so that it remains an empty card assigned.

This patch ignores to iterate widget hooks to the 'snd-soc-dummy'
component, else it will trigger memory fault because of invalid dereference
address of card->widgets.

Test by grep -rsI "hello" /sys/devices/platform/skl_nau88l25_ssm4567_i2s/

Conflicts:
	sound/soc/soc-dapm.c

Signed-off-by: Harry Pan <harry.pan@...el.com>
---
 sound/soc/soc-dapm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 581175a..0bc15c9 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -2188,6 +2188,9 @@ static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
 	int count = 0;
 	char *state = "not set";
 
+	if (!strcmp(cmpnt->name, "snd-soc-dummy"))
+		return 0;
+
 	list_for_each_entry(w, &cmpnt->card->widgets, list) {
 		if (w->dapm != dapm)
 			continue;
-- 
2.1.2