[PATCH 3/4] ocfs2: Fix possible use-after-free with AIO

[Jan Kara <jack@xxxxxxx>]

Running AIO is pinning inode in memory using file reference. Once AIO
is completed using aio_complete(), file reference is put and inode can
be freed from memory. So we have to be sure that calling aio_complete()
is the last thing we do with the inode.

CC: Joel Becker <jlbec@xxxxxxxxxxxx>
CC: ocfs2-devel@xxxxxxxxxxxxxx
CC: stable@xxxxxxxxxxxxxxx
Acked-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/ocfs2/aops.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 6577432..340bd02 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -593,9 +593,9 @@ static void ocfs2_dio_end_io(struct kiocb *iocb,
        level = ocfs2_iocb_rw_locked_level(iocb);
        ocfs2_rw_unlock(inode, level);
 
+       inode_dio_done(inode);
        if (is_async)
                aio_complete(iocb, ret, 0);
-       inode_dio_done(inode);
 }
 
 /*
-- 
1.7.1