Patch "mfd: max8925: Fix possible NULL pointer dereference on i2c_new_dummy error" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

    mfd: max8925: Fix possible NULL pointer dereference on i2c_new_dummy error

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mfd-max8925-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 96cf3dedc491d2f1f66cc26217f2b06b0c7b6797 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Date: Tue, 11 Feb 2014 11:03:33 +0100
Subject: mfd: max8925: Fix possible NULL pointer dereference on i2c_new_dummy error

From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>

commit 96cf3dedc491d2f1f66cc26217f2b06b0c7b6797 upstream.

During probe the driver allocates dummy I2C devices for RTC and ADC
with i2c_new_dummy() but it does not check the return value of this
calls.

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 i2c_unregister_device().

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

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/mfd/max8925-i2c.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/mfd/max8925-i2c.c
+++ b/drivers/mfd/max8925-i2c.c
@@ -181,9 +181,18 @@ static int max8925_probe(struct i2c_clie
 	mutex_init(&chip->io_lock);
 
 	chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR);
+	if (!chip->rtc) {
+		dev_err(chip->dev, "Failed to allocate I2C device for RTC\n");
+		return -ENODEV;
+	}
 	i2c_set_clientdata(chip->rtc, chip);
 
 	chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR);
+	if (!chip->adc) {
+		dev_err(chip->dev, "Failed to allocate I2C device for ADC\n");
+		i2c_unregister_device(chip->rtc);
+		return -ENODEV;
+	}
 	i2c_set_clientdata(chip->adc, chip);
 
 	device_init_wakeup(&client->dev, 1);


Patches currently in stable-queue which might be from k.kozlowski@xxxxxxxxxxx are

queue-3.14/mfd-max8998-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.14/mfd-tps65910-fix-possible-invalid-pointer-dereference-on-regmap_add_irq_chip-fail.patch
queue-3.14/mfd-88pm860x-fix-i2c-device-resource-leak-on-regmap-init-fail.patch
queue-3.14/mfd-88pm860x-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.14/mfd-max77686-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.14/mfd-88pm800-fix-i2c-device-resource-leak-if-probe-fails.patch
queue-3.14/mfd-max8925-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.14/mfd-max77693-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.14/mfd-sec-core-fix-possible-null-pointer-dereference-when-i2c_new_dummy-error.patch
queue-3.14/mfd-max8997-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
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