Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct vmw_surface_dirty.

[1] 
https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Zack Rusin <[email protected]>
Cc: VMware Graphics Reviewers <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c 
b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 5db403ee8261..2d1d857f99ae 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -77,7 +77,7 @@ struct vmw_surface_offset {
 struct vmw_surface_dirty {
        struct vmw_surface_cache cache;
        u32 num_subres;
-       SVGA3dBox boxes[];
+       SVGA3dBox boxes[] __counted_by(num_subres);
 };
 
 static void vmw_user_surface_free(struct vmw_resource *res);
-- 
2.34.1

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