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media: v4l2-core: fix a use-after-free bug of sd->devnode 

commit 6990570f7e0a6078e11b9c5dc13f4b6e3f49a398 upstream.

sd->devnode is released after calling
v4l2_subdev_release. Therefore it should be set
to NULL so that the subdev won't hold a pointer
to a released object. This fixes a reference
after free bug in function
v4l2_device_unregister_subdev

Fixes: 0e43734d4c ("media: v4l2-subdev: add release() internal op")

Cc: stable@vger.kernel.org
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dafna Hirschfeld 2020-02-19 16:25:54 +01:00 committed by Greg Kroah-Hartman
parent e7cd85f398
commit 5f80d17c51
1 changed files with 1 additions and 0 deletions
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1
drivers/media/v4l2-core/v4l2-device.c
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@ -179,6 +179,7 @@ static void v4l2_subdev_release(struct v4l2_subdev *sd)
if (sd->internal_ops && sd->internal_ops->release)
sd->internal_ops->release(sd);
sd->devnode = NULL;
module_put(owner);
}