Patch "iio: inkern: fix a NULL dereference on error" has been added to the 4.4-stable tree

Patch "iio: inkern: fix a NULL dereference on error" has been added to the 4.4-stable tree

[gregkh]

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

    iio: inkern: fix a NULL dereference on error

to the 4.4-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:
     iio-inkern-fix-a-null-dereference-on-error.patch
and it can be found in the queue-4.4 subdirectory.

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


>From d81dac3c1c5295c61b15293074ac2bd3254e1875 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 26 Jan 2016 12:25:21 +0300
Subject: iio: inkern: fix a NULL dereference on error

From: Dan Carpenter <dan.carpenter@oracle.com>

commit d81dac3c1c5295c61b15293074ac2bd3254e1875 upstream.

In twl4030_bci_probe() there are some failure paths where we call
iio_channel_release() with a NULL pointer.  (Apparently, that driver can
opperate without a valid channel pointer).  Let's fix it by adding a
NULL check in iio_channel_release().

Fixes: 2202e1fc5a29 ('drivers: power: twl4030_charger: fix link problems when building as module')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iio/inkern.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -351,6 +351,8 @@ EXPORT_SYMBOL_GPL(iio_channel_get);
 
 void iio_channel_release(struct iio_channel *channel)
 {
+	if (!channel)
+		return;
 	iio_device_put(channel->indio_dev);
 	kfree(channel);
 }


Patches currently in stable-queue which might be from dan.carpenter@oracle.com are

queue-4.4/intel_scu_ipcutil-underflow-in-scu_reg_access.patch
queue-4.4/iio-inkern-fix-a-null-dereference-on-error.patch