linux-kernel - [PATCH 2/2] ASoC: core: Fix possible NULL pointer dereference

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Date:	Fri,  4 Jul 2014 14:23:00 +0530
From:	Tushar Behera <tushar.b@...sung.com>
To:	alsa-devel@...a-project.org, linux-samsung-soc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	dianders@...omium.org, tiwai@...e.de, perex@...ex.cz,
	broonie@...nel.org, lgirdwood@...il.com, galak@...eaurora.org,
	kgene.kim@...sung.com, ijc+devicetree@...lion.org.uk,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org,
	trblinux@...il.com
Subject: [PATCH 2/2] ASoC: core: Fix possible NULL pointer dereference

snd_soc_of_parse_card_name() may be called before card->dev has been
set, which results in a kernel panic.

Unable to handle kernel NULL pointer dereference at virtual address 00000210
PC is at snd_soc_of_parse_card_name+0x18/0x54
LR is at snow_probe+0x5c/0xd4

Add an error check in snd_soc_of_parse_card_name() to take care of this
case and print out a message in case of error.

Signed-off-by: Tushar Behera <tushar.b@...sung.com>
---
 sound/soc/soc-core.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index c4db07f..2e4bdc0 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4391,9 +4391,16 @@ EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);
 int snd_soc_of_parse_card_name(struct snd_soc_card *card,
 			       const char *propname)
 {
-	struct device_node *np = card->dev->of_node;
+	struct device_node *np;
 	int ret;
 
+	if (!card->dev) {
+		pr_err("card->dev is not set before calling %s\n", __func__);
+		return -EINVAL;
+	}
+
+	np = card->dev->of_node;
+
 	ret = of_property_read_string_index(np, propname, 0, &card->name);
 	/*
 	 * EINVAL means the property does not exist. This is fine providing
-- 
1.7.9.5

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