Do not dereference node before the check if node is NULL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 drivers/gpu/drm/drm_mm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 04de6fd..cb39f45 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -179,12 +179,14 @@ static void drm_mm_insert_helper(struct drm_mm_node 
*hole_node,
 int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
 {
        struct drm_mm_node *hole;
-       u64 end = node->start + node->size;
+       u64 end;
        u64 hole_start;
        u64 hole_end;

        BUG_ON(node == NULL);

+       end = node->start + node->size;
+
        /* Find the relevant hole to add our node to */
        drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
                if (hole_start > node->start || hole_end < end)
-- 
2.1.4

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