drm/vmwgfx: Fix a potential integer overflow

Found by coverity.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 7d3cb78..d492d57 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1671,7 +1671,7 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
                 *      1. Bounding box (assuming 32bpp) must be < prim_bb_mem
                 *      2. Total pixels (assuming 32bpp) must be < prim_bb_mem
                 */
-               u64 bb_mem    = bounding_box.w * bounding_box.h * 4;
+               u64 bb_mem    = (u64) bounding_box.w * bounding_box.h * 4;
                u64 pixel_mem = total_pixels * 4;
 
                if (bb_mem > dev_priv->prim_bb_mem) {