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

To: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Subject: [PATCH 3/4] ocfs2: Fix possible use-after-free with AIO
From: Jan Kara <jack@xxxxxxx>
Date: Wed, 30 Jan 2013 00:28:00 +0100
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxx, Jan Kara <jack@xxxxxxx>, Joel Becker <jlbec@xxxxxxxxxxxx>, stable@xxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1359502081-20240-1-git-send-email-jack@xxxxxxx>
References: <1359502081-20240-1-git-send-email-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

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