As syzbot reported an use-after-free issue in f2fs_write_end_io().
It is caused by below race condition:
loop device umount
- worker_thread
- loop_process_work
- do_req_filebacked
- lo_rw_aio
- lo_rw_aio_complete
- blk_mq_end_request
- blk_update_request
- f2fs_write_end_io
- dec_page_count
- folio_end_writeback
- kill_f2fs_super
- kill_block_super
- f2fs_put_super
: free(sbi)
: get_pages(, F2FS_WB_CP_DATA)
accessed sbi which is freed
In kill_f2fs_super(), we will drop all page caches of f2fs inodes before
call free(sbi), it guarantee that all folios should end its writeback, so
it should be safe to access sbi before last folio_end_writeback().
Let's relocate ckpt thread wakeup flow before folio_end_writeback() to
resolve this issue.
Cc: [email protected]
Fixes: e234088758fc ("f2fs: avoid wait if IO end up when do_checkpoint for
better performance")
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=b4444e3c972a7a124187
Signed-off-by: Chao Yu <[email protected]>
---
fs/f2fs/data.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index c30e69392a62..8550c964b71c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -356,14 +356,20 @@ static void f2fs_write_end_io(struct bio *bio)
folio->index != nid_of_node(folio));
dec_page_count(sbi, type);
+
+ /*
+ * we should access sbi before folio_end_writeback() to
+ * avoid racing w/ kill_f2fs_super()
+ */
+ if (type == F2FS_WB_CP_DATA && !get_pages(sbi, type) &&
+ wq_has_sleeper(&sbi->cp_wait))
+ wake_up(&sbi->cp_wait);
+
if (f2fs_in_warm_node_list(sbi, folio))
f2fs_del_fsync_node_entry(sbi, folio);
folio_clear_f2fs_gcing(folio);
folio_end_writeback(folio);
}
- if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
- wq_has_sleeper(&sbi->cp_wait))
- wake_up(&sbi->cp_wait);
bio_put(bio);
}
--
2.40.1
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