[patch] drm/exynos: potential use after free in exynos_drm_open()

[Dan Carpenter]

If exynos_drm_subdrv_open() fails then we re-use "file_priv".

Fixes: 96f5421523df ('drm/exynos: use a new anon file for exynos gem mmaper')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 9d096a0c5f8d..3c845292845a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -174,6 +174,7 @@ static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
 	if (ret) {
 		kfree(file_priv);
 		file->driver_priv = NULL;
+		return ret;
 	}
 
 	anon_filp = anon_inode_getfile("exynos_gem", &exynos_drm_gem_fops,
@@ -186,7 +187,7 @@ static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
 	anon_filp->f_mode = FMODE_READ | FMODE_WRITE;
 	file_priv->anon_filp = anon_filp;
 
-	return ret;
+	return 0;
 }
 
 static void exynos_drm_preclose(struct drm_device *dev,