linux-kernel - [PATCH 3.16 083/133] mfd: max8998: Fix potential NULL pointer dereference

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Message-ID: <lsq.1511315893.616126543@decadent.org.uk>
Date:   Wed, 22 Nov 2017 01:58:13 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Christophe JAILLET" <christophe.jaillet@...adoo.fr>,
        "Lee Jones" <lee.jones@...aro.org>
Subject: [PATCH 3.16 083/133] mfd: max8998: Fix potential NULL pointer
 dereference

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

commit 2042f3c29f2f11129434de8a610878e8a15b4174 upstream.

if 'max8998_i2c_parse_dt_pdata() fails (when out of memory), a NULL
pointer dereference will occur in the error handling code.

Return directly instead.

Fixes: ee999fb3f17f("mfd: max8998: Add support for Device Tree")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mfd/max8998.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -195,10 +195,8 @@ static int max8998_i2c_probe(struct i2c_
 
 	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 		pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
-		if (IS_ERR(pdata)) {
-			ret = PTR_ERR(pdata);
-			goto err;
-		}
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
 	}
 
 	i2c_set_clientdata(i2c, max8998);