Patch "extcon: palmas: Check the parent instance to prevent the NULL" has been added to the 4.4-stable tree

Patch "extcon: palmas: Check the parent instance to prevent the NULL" 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

    extcon: palmas: Check the parent instance to prevent the NULL

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:
     extcon-palmas-check-the-parent-instance-to-prevent-the-null.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 foo@baz Sun Nov 19 12:02:55 CET 2017
From: Roger Quadros <rogerq@ti.com>
Date: Thu, 8 Dec 2016 10:45:31 +0200
Subject: extcon: palmas: Check the parent instance to prevent the NULL

From: Roger Quadros <rogerq@ti.com>


[ Upstream commit 9fe172b9be532acc23e35ba693700383ab775e66 ]

extcon-palmas must be child of palmas and expects parent's
drvdata to be valid. Check for non NULL parent drvdata and
fail if it is NULL. Not doing so will result in a NULL
pointer dereference later in the probe() parent drvdata
is NULL (e.g. misplaced extcon-palmas node in device tree).

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/extcon/extcon-palmas.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -190,6 +190,11 @@ static int palmas_usb_probe(struct platf
 	struct palmas_usb *palmas_usb;
 	int status;
 
+	if (!palmas) {
+		dev_err(&pdev->dev, "failed to get valid parent\n");
+		return -EINVAL;
+	}
+
 	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
 	if (!palmas_usb)
 		return -ENOMEM;


Patches currently in stable-queue which might be from rogerq@ti.com are

queue-4.4/extcon-palmas-check-the-parent-instance-to-prevent-the-null.patch