[PATCH] drm/msm/dpu: check for null return of devm_kzalloc() in dpu_writeback_init()

[Hui Tang]

Because of the possilble failure of devm_kzalloc(), dpu_wb_conn might
be NULL and will cause null pointer derefrence later.

Therefore, it might be better to check it and directly return -ENOMEM.

Fixes: 77b001acdcfe ("drm/msm/dpu: add the writeback connector layer")
Signed-off-by: Hui Tang <tanghui20 at huawei.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
index 088ec990a2f2..2a5a68366582 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c
@@ -70,6 +70,8 @@ int dpu_writeback_init(struct drm_device *dev, struct drm_encoder *enc,
 	int rc = 0;
 
 	dpu_wb_conn = devm_kzalloc(dev->dev, sizeof(*dpu_wb_conn), GFP_KERNEL);
+	if (!dpu_wb_conn)
+		return -ENOMEM;
 
 	drm_connector_helper_add(&dpu_wb_conn->base.base, &dpu_wb_conn_helper_funcs);
 
-- 
2.17.1