From: Ye Bin <yebin10@xxxxxxxxxx> commit e0d5fc7a6d80ac2406c7dfc6bb625201d0250a8a upstream. As in 'jbd2_fc_wait_bufs' if buffer isn't uptodate, will return -EIO without update 'journal->j_fc_off'. But 'jbd2_fc_release_bufs' will release buffer head from ‘j_fc_off - 1’ if 'bh' is NULL will terminal release which will lead to buffer head buffer head reference count leak. To solve above issue, update 'journal->j_fc_off' before return -EIO. Cc: stable@xxxxxxxxxx Signed-off-by: Ye Bin <yebin10@xxxxxxxxxx> Reviewed-by: Jan Kara <jack@xxxxxxx> Link: https://lore.kernel.org/r/20220914100812.1414768-2-yebin10@xxxxxxxxxx Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/jbd2/journal.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -926,8 +926,14 @@ int jbd2_fc_wait_bufs(journal_t *journal wait_on_buffer(bh); put_bh(bh); journal->j_fc_wbuf[i] = NULL; - if (unlikely(!buffer_uptodate(bh))) + /* + * Update j_fc_off so jbd2_fc_release_bufs can release remain + * buffer head. + */ + if (unlikely(!buffer_uptodate(bh))) { + journal->j_fc_off = i; return -EIO; + } } return 0;
