drm/msm/hdmi: Add missing check for alloc_ordered_workqueue

[ Upstream commit afe4cb96153a0d8003e4e4ebd91b5c543e10df84 ]

Add check for the return value of alloc_ordered_workqueue as it may return
NULL pointer and cause NULL pointer dereference in `hdmi_hdcp.c` and
`hdmi_hpd.c`.

Fixes: c6a57a50ad56 ("drm/msm/hdmi: add hdmi hdcp support (V3)")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/517211/
Link: https://lore.kernel.org/r/20230106023011.3985-1-jiasheng@iscas.ac.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 8cd5d50..333cedc 100644 (file)
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -255,6 +255,10 @@ static struct hdmi *msm_hdmi_init(struct platform_device *pdev)
        devm_pm_runtime_enable(&pdev->dev);
 
        hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);
+       if (!hdmi->workq) {
+               ret = -ENOMEM;
+               goto fail;
+       }
 
        hdmi->i2c = msm_hdmi_i2c_init(hdmi);
        if (IS_ERR(hdmi->i2c)) {