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bcachefs: Fix shift-out-of-bounds in bch2_blacklist_entries_gc

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This series fix the shift-out-of-bounds issue in
bch2_blacklist_entries_gc().

Instead of passing 0 to eytzinger0_first() when iterating the entries,
we explicitly check 0 and initialize i to be 0.

syzbot has tested the proposed patch and the reproducer did not trigger
any issue:

Reported-and-tested-by: syzbot+835d255ad6bc7f29ee12@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=835d255ad6bc7f29ee12
Signed-off-by: Pei Li <peili.dev@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Pei Li 2024-06-25 11:41:29 -07:00 committed by Kent Overstreet
parent 211c581de2
commit 472237b69d
1 changed files with 1 additions and 1 deletions
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2
fs/bcachefs/journal_seq_blacklist.c
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@ -232,7 +232,7 @@ bool bch2_blacklist_entries_gc(struct bch_fs *c)
BUG_ON(nr != t->nr); BUG_ON(nr != t->nr);
unsigned i; unsigned i;
for (src = bl->start, i = eytzinger0_first(t->nr); for (src = bl->start, i = t->nr == 0 ? 0 : eytzinger0_first(t->nr);
src < bl->start + nr; src < bl->start + nr;
src++, i = eytzinger0_next(i, nr)) { src++, i = eytzinger0_next(i, nr)) {
BUG_ON(t->entries[i].start != le64_to_cpu(src->start)); BUG_ON(t->entries[i].start != le64_to_cpu(src->start));