[PATCH 4.4 60/91] drm/msm: Verify that MSM_SUBMIT_BO_FLAGS are set

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jordan Crouse <jcro...@codeaurora.org>


[ Upstream commit a6cb3b864b21b7345f824a4faa12b723c8aaf099 ]

For every submission buffer object one of MSM_SUBMIT_BO_WRITE
and MSM_SUBMIT_BO_READ must be set (and nothing else). If we
allowed zero then the buffer object would never get queued to
be unreferenced.

Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
Signed-off-by: Rob Clark <robdcl...@gmail.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/gpu/drm/msm/msm_gem_submit.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -90,7 +90,8 @@ static int submit_lookup_objects(struct
                        pagefault_disable();
                }
 
-               if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) {
+               if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
+                       !(submit_bo.flags & MSM_SUBMIT_BO_FLAGS)) {
                        DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
                        ret = -EINVAL;
                        goto out_unlock;