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[ Upstream commit a1ee1c08fcd5af03187dcd41dcab12fd5b379555 ] cl is freed on error of calling device_register, but this object is return later, which will cause uaf issue. Fix it by return NULL on error. Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by: Sasha Levin <sashal@kernel.org>