From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Sun, 29 Dec 2024 14:37:15 +0000 (-0500)
Subject: bcachefs: bch2_btree_iter_peek_slot() handles navigating to nonexistent depth
X-Git-Tag: io_uring-6.14-20240131~27^2~15
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=d3d0fac57d4679024199706a2aa6d2a4a477bfa3;p=linux-block.git

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 c291d495b85b..367231ab1980 100644
--- 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;