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[ Upstream commita36e506711] It will cause null-ptr-deref if platform_get_resource_byname() returns NULL, we need check the return value. Fixes:c6a57a50ad("drm/msm/hdmi: add hdmi hdcp support (V3)") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Patchwork: https://patchwork.freedesktop.org/patch/482992/ Link: https://lore.kernel.org/r/20220422032227.2991553-1-yangyingliang@huawei.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>