drm/exynos: fix a potential error pointer dereference

Smatch reports the warning below:
drivers/gpu/drm/exynos/exynos_hdmi.c:1864 hdmi_bind()
error: 'crtc' dereferencing possible ERR_PTR()

The return value of exynos_drm_crtc_get_by_type maybe ERR_PTR(-ENODEV),
which can not be used directly. Fix this by checking the return value
before using it.

Signed-off-by: Xiang Yang <xiangyang3@huawei.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index f3aaa4ea3e68208b1f6bfccaf49a2d646e43ded1..dd9903eab563eee8537dfb731dca112f1dd53dea 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -1861,6 +1861,8 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
                return ret;
 
        crtc = exynos_drm_crtc_get_by_type(drm_dev, EXYNOS_DISPLAY_TYPE_HDMI);
+       if (IS_ERR(crtc))
+               return PTR_ERR(crtc);
        crtc->pipe_clk = &hdata->phy_clk;
 
        ret = hdmi_create_connector(encoder);