linux-kernel - [PATCH 3.10 22/86] mfd: sec-core: Fix possible NULL pointer dereference when i2c_new

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Message-Id: <20140504154143.394570764@linuxfoundation.org>
Date:	Sun,  4 May 2014 11:40:57 -0400
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 3.10 22/86] mfd: sec-core: Fix possible NULL pointer dereference when i2c_new_dummy error

3.10-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mfd/sec-core.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -199,6 +199,10 @@ static int sec_pmic_probe(struct i2c_cli
 	}
 
 	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);
 
 	if (pdata && pdata->cfg_pmic_irq)


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