Jan Kara 7f5aa21508 jbd2: Avoid possible NULL dereference in jbd2_journal_begin_ordered_truncate() ... If we race with commit code setting i_transaction to NULL, we could possibly dereference it. Proper locking requires the journal pointer (to access journal->j_list_lock), which we don't have. So we have to change the prototype of the function so that filesystem passes us the journal pointer. Also add a more detailed comment about why the function jbd2_journal_begin_ordered_truncate() does what it does and how it should be used. Thanks to Dan Carpenter <error27@gmail.com> for pointing to the suspitious code. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Joel Becker <joel.becker@oracle.com> CC: linux-ext4@vger.kernel.org CC: ocfs2-devel@oss.oracle.com CC: mfasheh@suse.de CC: Dan Carpenter <error27@gmail.com>		2009-02-10 11:15:34 -05:00
..
checkpoint.c	jbd2: don't give up looking for space so easily in __jbd2_log_wait_for_space	2008-11-06 22:38:07 -05:00
commit.c	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	2009-01-08 17:14:59 -08:00
journal.c	jbd2: Fix return value of jbd2_journal_start_commit()	2009-02-10 11:27:46 -05:00
Kconfig	fs/Kconfig: move ext2, ext3, ext4, JBD, JBD2 out	2008-10-20 11:43:59 -07:00
Makefile
recovery.c	jbd2: fix error handling for checkpoint io	2008-10-10 20:29:13 -04:00
revoke.c
transaction.c	jbd2: Avoid possible NULL dereference in jbd2_journal_begin_ordered_truncate()	2009-02-10 11:15:34 -05:00