This is a note to let you know that I've just added the patch titled
mfd: max8997: Fix possible NULL pointer dereference on i2c_new_dummy error
to the 3.4-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-max8997-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 97dc4ed3fa377ec91bb60ba98b70d645c2099384 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Date: Tue, 11 Feb 2014 11:03:34 +0100
Subject: mfd: max8997: Fix possible NULL pointer dereference on i2c_new_dummy error
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
commit 97dc4ed3fa377ec91bb60ba98b70d645c2099384 upstream.
During probe the driver allocates dummy I2C devices for RTC, haptic and
MUIC 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, haptic or MUIC 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/max8997.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- a/drivers/mfd/max8997.c
+++ b/drivers/mfd/max8997.c
@@ -149,10 +149,26 @@ static int max8997_i2c_probe(struct i2c_
mutex_init(&max8997->iolock);
max8997->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
+ if (!max8997->rtc) {
+ dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n");
+ return -ENODEV;
+ }
i2c_set_clientdata(max8997->rtc, max8997);
+
max8997->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
+ if (!max8997->haptic) {
+ dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n");
+ ret = -ENODEV;
+ goto err_i2c_haptic;
+ }
i2c_set_clientdata(max8997->haptic, max8997);
+
max8997->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
+ if (!max8997->muic) {
+ dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n");
+ ret = -ENODEV;
+ goto err_i2c_muic;
+ }
i2c_set_clientdata(max8997->muic, max8997);
pm_runtime_set_active(max8997->dev);
@@ -179,7 +195,9 @@ static int max8997_i2c_probe(struct i2c_
err_mfd:
mfd_remove_devices(max8997->dev);
i2c_unregister_device(max8997->muic);
+err_i2c_muic:
i2c_unregister_device(max8997->haptic);
+err_i2c_haptic:
i2c_unregister_device(max8997->rtc);
err:
kfree(max8997);
Patches currently in stable-queue which might be from k.kozlowski@xxxxxxxxxxx are
queue-3.4/mfd-max8998-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.4/mfd-max8925-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
queue-3.4/mfd-max8997-fix-possible-null-pointer-dereference-on-i2c_new_dummy-error.patch
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