This is a note to let you know that I've just added the patch titled
mfd: max8998: 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-max8998-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 ed26f87b9f71693a1d1ee85f5e6209601505080f Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Date: Tue, 11 Feb 2014 11:03:35 +0100
Subject: mfd: max8998: Fix possible NULL pointer dereference on i2c_new_dummy error
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
commit ed26f87b9f71693a1d1ee85f5e6209601505080f upstream.
During probe the driver allocates dummy I2C device for RTC with i2c_new_dummy() but it does not check the return value of this call.
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 device, 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/max8998.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -152,6 +152,10 @@ static int max8998_i2c_probe(struct i2c_
mutex_init(&max8998->iolock);
max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
+ if (!max8998->rtc) {
+ dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
+ return -ENODEV;
+ }
i2c_set_clientdata(max8998->rtc, max8998);
max8998_irq_init(max8998);
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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