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| author | Ye Bin <yebin10@huawei.com> | 2022-09-14 13:08:11 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-10-01 06:46:52 +0300 |
| commit | e0d5fc7a6d80ac2406c7dfc6bb625201d0250a8a (patch) | |
| tree | 5d744ae0a8cad0fd3dabca9fdb58ee50009db5e9 | |
| parent | 7177dd009c7c04290891e9a534cd47d1b620bd04 (diff) | |
| download | linux-e0d5fc7a6d80ac2406c7dfc6bb625201d0250a8a.tar.xz | |
jbd2: fix potential buffer head reference count leak
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@kernel.org
Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220914100812.1414768-2-yebin10@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/jbd2/journal.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index f669ae1ff7a2..d00193077bce 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -925,8 +925,14 @@ int jbd2_fc_wait_bufs(journal_t *journal, int num_blks) 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; |