[PATCH v2 25/40] drm: Detect overflow in drm_mm_reserve_node()

[Chris Wilson]

Protect ourselves from a caller passing in node.start + node.size that
will overflow and trick us into reserving that node.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_mm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index ead164093ac7..6450690f5578 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -308,10 +308,9 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
 	u64 hole_start, hole_end;
 	u64 adj_start, adj_end;
 
-	if (WARN_ON(node->size == 0))
-		return -EINVAL;
-
 	end = node->start + node->size;
+	if (unlikely(end <= node->start))
+		return -ENOSPC;
 
 	/* Find the relevant hole to add our node to */
 	hole = drm_mm_interval_tree_iter_first(&mm->interval_tree,
-- 
2.11.0