drm/ttm: request zeroed system memory pages for new TT buffer objects

Fixes an information leak to userspace, we were handing out un-zeroed pages
for any newly created TTM_PL_TT buffer.

Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Tested-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index a4d38d85909..ef06194c5aa 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -394,7 +394,8 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 
         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
                 if (bo->ttm == NULL) {
-                        ret = ttm_bo_add_ttm(bo, false);
+                        bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
+                        ret = ttm_bo_add_ttm(bo, zero);
                         if (ret)
                                 goto out_err;
                 }