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jbd2: fix potential buffer head reference count leak

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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>
This commit is contained in:
Ye Bin 2022-09-14 18:08:11 +08:00 committed by Theodore Ts'o
parent 7177dd009c
commit e0d5fc7a6d
1 changed files with 7 additions and 1 deletions
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8
fs/jbd2/journal.c
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@ -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;