drm/msm: bit of fb error checking

It's a problem that can't happen yet, since we don't support any
multi-planar formats yet.  But let's avoid nasty surprises when the
time comes.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/msm_fb.c b/drivers/gpu/drm/msm/msm_fb.c
index acf34ec80a7584c717984f2b2a541b78cab031ff..f4e42d506ff7eb3bedfa6b03323ac6913cbfa728 100644 (file)
--- a/drivers/gpu/drm/msm/msm_fb.c
+++ b/drivers/gpu/drm/msm/msm_fb.c
@@ -24,7 +24,7 @@
 struct msm_framebuffer {
        struct drm_framebuffer base;
        const struct msm_format *format;
-       struct drm_gem_object *planes[2];
+       struct drm_gem_object *planes[3];
 };
 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
 
@@ -202,6 +202,11 @@ struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 
        msm_fb->format = format;
 
+       if (n > ARRAY_SIZE(msm_fb->planes)) {
+               ret = -EINVAL;
+               goto fail;
+       }
+
        for (i = 0; i < n; i++) {
                unsigned int width = mode_cmd->width / (i ? hsub : 1);
                unsigned int height = mode_cmd->height / (i ? vsub : 1);