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bcachefs: add check for btree id against max in try read node

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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: syzbot+cf7b2215b5d70600ec00@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=cf7b2215b5d70600ec00
Fixes: 4409b8081d ("bcachefs: Repair pass for scanning for btree nodes")
Signed-off-by: Piotr Zalewski <pZ010001011111@proton.me>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Piotr Zalewski 2024-09-29 14:26:45 +00:00 committed by Kent Overstreet
parent 19773ec997
commit 0151d10a48
1 changed files with 3 additions and 0 deletions
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3
fs/bcachefs/btree_node_scan.c
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@ -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),