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The commitaef69d5475("media: v4l: fwnode: Add a convenience function for registering sensors") adds the function v4l2_async_notifier_parse_fwnode_sensor_common() to parse and register a subdevice and a subdev-notifier by parsing firmware information. This new subdev-notifier is stored in the new field 'subdev_notifier' in struct v4l2_subdev. In v4l2_async_unregister_subdev() this field is used to unregister and cleanup the subdev-notifier. A check for if the subdev-notifier is initialized or not was forgotten leading to a NULL pointer dereference in v4l2_async_notifier_cleanup() if a subdevice do not use the optional convince function to initialize the field. Fix this by checking in v4l2_async_notifier_cleanup() that it is provided whit a notifier making it safe to call with a NULL parameter. Fixes:aef69d5475("media: v4l: fwnode: Add a convenience function for registering sensors") Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.