linux

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History

Jan Kara a61d90d75d jbd: fix race in buffer processing in commit code

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: <stable@kernel.org>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2009-06-09 16:59:03 -07:00

checkpoint.c

jbd: don't give up looking for space so easily in __log_wait_for_space

2008-11-06 22:37:59 -05:00

commit.c

jbd: fix race in buffer processing in commit code

2009-06-09 16:59:03 -07:00

journal.c

jbd: fix oops in jbd_journal_init_inode() on corrupted fs

2009-04-02 19:04:52 -07:00

Kconfig

fs/Kconfig: move ext2, ext3, ext4, JBD, JBD2 out