[PATCH v6 12/16] drm/msm/gem: Validate lazy VM in GEM_NEW

[Rob Clark <robin.clark@oss.qualcomm.com>]

Otherwise creating a _NO_SHARE BO before any BOs are mapped could cause
a NPE.

Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/msm_gem.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index cb00bdf21ef6..153a4e4a916c 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -1138,9 +1138,13 @@ int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 	int ret;
 
 	if (flags & MSM_BO_NO_SHARE) {
+		struct msm_drm_private *priv = dev->dev_private;
 		struct msm_context *ctx = file->driver_priv;
 		struct drm_gpuvm *vm = msm_context_vm(dev, ctx);
 
+		if (!priv->gpu || !vm)
+			return UERR(EINVAL, dev, "not supported with shared VM");
+
 		r_obj = drm_gpuvm_resv_obj(vm);
 	}
 
-- 
2.55.0