linux-kernel - [PATCH] v4l: subdev: initialize sd->internal_ops in v4l2_subdev

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Message-Id: <1301667857-5145-2-git-send-email-herton.krzesinski@canonical.com>
Date:	Fri,  1 Apr 2011 11:24:17 -0300
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hans Verkuil <hverkuil@...all.nl>
Subject: [PATCH] v4l: subdev: initialize sd->internal_ops in v4l2_subdev_init

Many v4l drivers currently don't initialize their struct v4l2_subdev
with zeros, so since the addition of internal_ops in commit 45f6f84, we
are at risk of random oopses when code in v4l2_device_register_subdev
tries to dereference sd->internal_ops->*, as can be shown by the report
at http://bugs.launchpad.net/bugs/745213

So make sure internal_ops is cleared in v4l2_subdev_init.

BugLink: http://bugs.launchpad.net/bugs/745213
Cc: <stable@...nel.org> # .38.x
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/media/video/v4l2-subdev.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index 0b80644..0f70c74 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -324,6 +324,7 @@ void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
 	sd->grp_id = 0;
 	sd->dev_priv = NULL;
 	sd->host_priv = NULL;
+	sd->internal_ops = NULL;
 #if defined(CONFIG_MEDIA_CONTROLLER)
 	sd->entity.name = sd->name;
 	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
-- 
1.7.1

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