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jbd2: fix potential buffer head reference count leak

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commit e0d5fc7a6d 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@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ye Bin 2022-09-14 18:08:11 +08:00 committed by Greg Kroah-Hartman
parent eea3e455a3
commit 7a33dde572
1 changed files with 7 additions and 1 deletions
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8
fs/jbd2/journal.c
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@ -926,8 +926,14 @@ int jbd2_fc_wait_bufs(journal_t *journal, int num_blks)
wait_on_buffer(bh); wait_on_buffer(bh);
put_bh(bh); put_bh(bh);
journal->j_fc_wbuf[i] = NULL; 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 -EIO;
}
} }
return 0; return 0;