Add check for read node's btree_id against BTREE_ID_NR_MAX in try_read_btree_node to prevent triggering EBUG_ON condition in bch2_btree_id_root[1].
[1] https://syzkaller.appspot.com/bug?extid=cf7b2215b5d70600ec00 Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=cf7b2215b5d70600ec00 Fixes: 4409b8081d16 ("bcachefs: Repair pass for scanning for btree nodes") Signed-off-by: Piotr Zalewski <[email protected]> --- fs/bcachefs/btree_node_scan.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/bcachefs/btree_node_scan.c b/fs/bcachefs/btree_node_scan.c index b28c649c6838..a24b4004e8f0 100644 --- a/fs/bcachefs/btree_node_scan.c +++ b/fs/bcachefs/btree_node_scan.c @@ -171,6 +171,9 @@ static void try_read_btree_node(struct find_btree_nodes *f, struct bch_dev *ca, if (BTREE_NODE_LEVEL(bn) >= BTREE_MAX_DEPTH) return; + if (BTREE_NODE_ID(bn) >= BTREE_ID_NR_MAX) + return; + rcu_read_lock(); struct found_btree_node n = { .btree_id = BTREE_NODE_ID(bn), -- 2.46.2
