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@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com --- 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 767cfd05c628..370cb8ee91c9 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,