bcachefs: bch2_btree_iter_peek_slot() handles navigating to nonexistent depth

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/btree_iter.c b/fs/bcachefs/btree_iter.c
index c291d495b85baddccbd24bcc8bbac0167965584e..367231ab1980b13ef1f70e73a3dedeb8bb1642dd 100644 (file)
--- a/fs/bcachefs/btree_iter.c
+++ b/fs/bcachefs/btree_iter.c
@@ -2770,6 +2770,10 @@ struct bkey_s_c bch2_btree_iter_peek_slot(struct btree_iter *iter)
                goto out_no_locked;
        }
 
+       struct btree_path *path = btree_iter_path(trans, iter);
+       if (unlikely(!btree_path_node(path, path->level)))
+               return bkey_s_c_null;
+
        if ((iter->flags & BTREE_ITER_cached) ||
            !(iter->flags & (BTREE_ITER_is_extents|BTREE_ITER_filter_snapshots))) {
                k = bkey_s_c_null;