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Subject: media: v4l2-core: fix a use-after-free bug of sd->devnode Author: Dafna Hirschfeld dafna.hirschfeld@collabora.com Date: Wed Feb 19 16:25:54 2020 +0100

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: 0e43734d4c46e ("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

drivers/media/v4l2-core/v4l2-device.c | 1 + 1 file changed, 1 insertion(+)

---

diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c index 63d6b147b21e..41da73ce2e98 100644 --- a/drivers/media/v4l2-core/v4l2-device.c +++ b/drivers/media/v4l2-core/v4l2-device.c @@ -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); }