linux-kernel - [PATCH 3.13 061/151] mfd: sec-core: Fix possible NULL pointer dereference when i2c_new

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Message-Id: <1399045139-4531-62-git-send-email-kamal@canonical.com>
Date:	Fri,  2 May 2014 08:37:29 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Lee Jones <lee.jones@...aro.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 061/151] mfd: sec-core: Fix possible NULL pointer dereference when i2c_new_dummy error

3.13.11.1 -stable review patch.  If anyone has any objections, please let me know.

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

From: Krzysztof Kozlowski <k.kozlowski@...sung.com>

commit 65aba1e04916d72b30c028730a1e31860c225412 upstream.

During probe the sec-core driver allocates dummy I2C device for RTC with
i2c_new_dummy() but return value is not checked. In case of error
(i2c_new_device(): memory allocation failure or I2C address cannot be
used) this function returns NULL which is later used by
devm_regmap_init_i2c() or i2c_unregister_device().

If i2c_new_dummy() fails for RTC device, fail also the probe for main
MFD driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/mfd/sec-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
index 54cc255..c62cc96 100644
--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -280,6 +280,10 @@ static int sec_pmic_probe(struct i2c_client *i2c,
 	}
 
 	sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
+	if (!sec_pmic->rtc) {
+		dev_err(&i2c->dev, "Failed to allocate I2C for RTC\n");
+		return -ENODEV;
+	}
 	i2c_set_clientdata(sec_pmic->rtc, sec_pmic);
 
 	sec_pmic->regmap_rtc = devm_regmap_init_i2c(sec_pmic->rtc,
-- 
1.9.1

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