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From:   Kangjie Lu <kjlu@umn.edu>
To:     kjlu@umn.edu
Cc:     pakki001@umn.edu, Bard Liao <bardliao@realtek.com>,
        Oder Chiou <oder_chiou@realtek.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2] sound: codecs: fix a potential NULL pointer dereference
Date:   Mon, 25 Mar 2019 16:19:30 -0500
Message-Id: <20190325211930.18730-1-kjlu@umn.edu>
In-Reply-To: <4fa0e2cb-7044-12e1-33b3-14015c94e48d@codeaurora.org>
References: <4fa0e2cb-7044-12e1-33b3-14015c94e48d@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

In case devm_kzalloc fails, the patch returns -ENOMEM to avoid
potential NULL pointer dereference.

Also add a check for rt5663_parse_dp to pass the error code
upstream

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
---
v2: pass error code upstream in the caller as suggested by
Mukesh Ojha <mojha@codeaurora.org>
---
 sound/soc/codecs/rt5663.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/rt5663.c b/sound/soc/codecs/rt5663.c
index da6647015708..ab03ba499ad2 100644
--- a/sound/soc/codecs/rt5663.c
+++ b/sound/soc/codecs/rt5663.c
@@ -3480,6 +3480,8 @@ static int rt5663_parse_dp(struct rt5663_priv *rt5663, struct device *dev)
 		table_size = sizeof(struct impedance_mapping_table) *
 			rt5663->pdata.impedance_sensing_num;
 		rt5663->imp_table = devm_kzalloc(dev, table_size, GFP_KERNEL);
+		if (!rt5663->imp_table)
+			return -ENOMEM;
 		device_property_read_u32_array(dev,
 			"realtek,impedance_sensing_table",
 			(u32 *)rt5663->imp_table, table_size);
@@ -3507,8 +3509,11 @@ static int rt5663_i2c_probe(struct i2c_client *i2c,
 
 	if (pdata)
 		rt5663->pdata = *pdata;
-	else
-		rt5663_parse_dp(rt5663, &i2c->dev);
+	else {
+		ret = rt5663_parse_dp(rt5663, &i2c->dev);
+		if (ret)
+			return ret;
+	}
 
 	for (i = 0; i < ARRAY_SIZE(rt5663->supplies); i++)
 		rt5663->supplies[i].supply = rt5663_supply_names[i];
-- 
2.17.1