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| author | Theodore Ts'o <tytso@mit.edu> | 2011-12-12 10:53:02 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-12-12 10:53:02 -0500 |
| commit | b5a7e97039a80fae673ccc115ce595d5b88fb4ee (patch) | |
| tree | b8533e2cb3fc30da051487257cd24af6edeea83e /fs/ext4 | |
| parent | dc47ce90c3a822cd7c9e9339fe4d5f61dcb26b50 (diff) | |
| download | linux-b5a7e97039a80fae673ccc115ce595d5b88fb4ee.tar.gz linux-b5a7e97039a80fae673ccc115ce595d5b88fb4ee.tar.bz2 linux-b5a7e97039a80fae673ccc115ce595d5b88fb4ee.zip | |
ext4: fix ext4_end_io_dio() racing against fsync()
We need to make sure iocb->private is cleared *before* we put the
io_end structure on i_completed_io_list. Otherwise fsync() could
potentially run on another CPU and free the iocb structure out from
under us.
Reported-by: Kent Overstreet <koverstreet@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 848f436df29f..d2c86633811f 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2781,10 +2781,11 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, iocb->private, io_end->inode->i_ino, iocb, offset, size); + iocb->private = NULL; + /* if not aio dio with unwritten extents, just free io and return */ if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { ext4_free_io_end(io_end); - iocb->private = NULL; out: if (is_async) aio_complete(iocb, ret, 0); @@ -2807,7 +2808,6 @@ out: spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); /* queue the work to convert unwritten extents to written */ - iocb->private = NULL; queue_work(wq, &io_end->work); /* XXX: probably should move into the real I/O completion handler */ |