syzbot report slab-out-of-bounds in journal_entry_dev_usage_to_text, it because vstruct_bytes(entry) smaller than sizeof(struct jset_entry_dev_usage), overflow occurs when calculating the difference in jset_entry_dev_usage_nr_types(u).
Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=05d7520be047c9be86e0 Signed-off-by: Edward Adam Davis <[email protected]> --- fs/bcachefs/sb-clean.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/bcachefs/sb-clean.c b/fs/bcachefs/sb-clean.c index 47f10ab57f40..278e1a25159a 100644 --- a/fs/bcachefs/sb-clean.c +++ b/fs/bcachefs/sb-clean.c @@ -310,6 +310,9 @@ static void bch2_sb_clean_to_text(struct printbuf *out, struct bch_sb *sb, !entry->u64s) continue; + if (vstruct_bytes(entry) < sizeof(struct jset_entry_dev_usage)) + continue; + bch2_journal_entry_to_text(out, NULL, entry); prt_newline(out); } -- 2.43.0
