drm/i915: Update the restrict check to filter out wrong Ring ID passed by user-space

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index b9dcc28..0aa1b4c 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1037,7 +1037,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
        if (args->flags & I915_EXEC_IS_PINNED)
                flags |= I915_DISPATCH_PINNED;
 
-       if ((args->flags & I915_EXEC_RING_MASK) > I915_NUM_RINGS) {
+       if ((args->flags & I915_EXEC_RING_MASK) > LAST_USER_RING) {
                DRM_DEBUG("execbuf with unknown ring: %d\n",
                          (int)(args->flags & I915_EXEC_RING_MASK));
                return -EINVAL;

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 5483916..7c0eb33 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -63,6 +63,7 @@ struct  intel_ring_buffer {
                VECS,
        } id;
 #define I915_NUM_RINGS 4
+#define LAST_USER_RING (VECS + 1)
        u32             mmio_base;
        void            __iomem *virtual_start;
        struct          drm_device *dev;