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path: root/drivers/vfio/vfio_main.c
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Diffstat (limited to 'drivers/vfio/vfio_main.c')
-rw-r--r--drivers/vfio/vfio_main.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 40732e8ed4c6..e31e1952d7b8 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -946,6 +946,11 @@ void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
unsigned long last;
comb_start = interval_tree_iter_first(root, 0, ULONG_MAX);
+
+ /* Empty list */
+ if (WARN_ON_ONCE(!comb_start))
+ return;
+
curr = comb_start;
while (curr) {
last = curr->last;
@@ -975,6 +980,11 @@ void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
prev = curr;
curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
}
+
+ /* Empty list or no nodes to combine */
+ if (WARN_ON_ONCE(min_gap == ULONG_MAX))
+ break;
+
comb_start->last = comb_end->last;
interval_tree_remove(comb_end, root);
cur_nodes--;