diff options
| author | Jan Kara <jack@suse.cz> | 2009-06-09 16:26:26 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-07-02 16:31:33 -0700 |
| commit | c66a1c990f0f9ec38765ca5c54953523326e18d5 (patch) | |
| tree | a15202efa793f22b679f7c2f298f48eec1b95bce | |
| parent | 18223acf5db925a001db7f6087eaacf0007235d0 (diff) | |
jbd: fix race in buffer processing in commit code
commit a61d90d75d0f9e86432c45b496b4b0fbf0fd03dc upstream.
In commit code, we scan buffers attached to a transaction. During this
scan, we sometimes have to drop j_list_lock and then we recheck whether
the journal buffer head didn't get freed by journal_try_to_free_buffers().
But checking for buffer_jbd(bh) isn't enough because a new journal head
could get attached to our buffer head. So add a check whether the journal
head remained the same and whether it's still at the same transaction and
list.
This is a nasty bug and can cause problems like memory corruption (use after
free) or trigger various assertions in JBD code (observed).
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/jbd/commit.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c index ae08c057e75..558088d5377 100644 --- a/fs/jbd/commit.c +++ b/fs/jbd/commit.c @@ -238,7 +238,7 @@ write_out_data: spin_lock(&journal->j_list_lock); } /* Someone already cleaned up the buffer? */ - if (!buffer_jbd(bh) + if (!buffer_jbd(bh) || bh2jh(bh) != jh || jh->b_transaction != commit_transaction || jh->b_jlist != BJ_SyncData) { jbd_unlock_bh_state(bh); @@ -463,7 +463,9 @@ void journal_commit_transaction(journal_t *journal) spin_lock(&journal->j_list_lock); continue; } - if (buffer_jbd(bh) && jh->b_jlist == BJ_Locked) { + if (buffer_jbd(bh) && bh2jh(bh) == jh && + jh->b_transaction == commit_transaction && + jh->b_jlist == BJ_Locked) { __journal_unfile_buffer(jh); jbd_unlock_bh_state(bh); journal_remove_journal_head(bh); |