From: Ben Skeggs <bskeggs@xxxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Tested-by: Marcin Slusarz <marcin.slusarz@xxxxxxxxx>
Cc: stable@xxxxxxxxxx
---
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;
}
--
1.7.6.1
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