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fs: Fix possible use-after-free with AIO 

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: Christoph Hellwig <hch@infradead.org>
CC: Jens Axboe <axboe@kernel.dk>
CC: Jeff Moyer <jmoyer@redhat.com>
CC: stable@vger.kernel.org
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Kara 2013-01-30 00:28:01 +01:00 committed by Al Viro
parent da2d8455ed
commit 54c807e71d
1 changed files with 1 additions and 1 deletions
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2
fs/direct-io.c
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@ -261,9 +261,9 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret, bool is
dio->end_io(dio->iocb, offset, transferred,
dio->private, ret, is_async);
} else {
inode_dio_done(dio->inode);
if (is_async)
aio_complete(dio->iocb, ret, 0);
inode_dio_done(dio->inode);
}
return ret;