[Intel-gfx] [PATCH 4/4] drm/i915: Fix potential NULL pointer de-reference in ggtt unbind.

[Namrta Salonie]

    Found by static analysis tool.

Signed-off-by: Namrta Salonie <namrta.salonie at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8afda45..705b1e6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3097,7 +3097,10 @@ i915_gem_obj_ggtt_pin(struct drm_i915_gem_object *obj,
 static inline int
 i915_gem_object_ggtt_unbind(struct drm_i915_gem_object *obj)
 {
-	return i915_vma_unbind(i915_gem_obj_to_ggtt(obj));
+	struct i915_vma *vma = i915_gem_obj_to_ggtt(obj);
+	if (!vma)
+		return -EINVAL;
+	return i915_vma_unbind(vma);
 }
 
 void i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,
-- 
1.7.9.5