From: Ben Skeggs bskeggs@redhat.com

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 --- drivers/gpu/drm/ttm/ttm_bo.c | 3 ++- 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 a4d38d8..ef06194 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; }