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io_uring: use rcu_dereference in io_close

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Accessing the file table needs a rcu_dereference_protected().

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220518084005.3255380-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-05-18 10:40:05 +02:00 committed by Jens Axboe
parent a294bef57c
commit 0bf1dbee9b
1 changed files with 2 additions and 1 deletions
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3
fs/io_uring.c
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@ -5372,7 +5372,8 @@ static int io_close(struct io_kiocb *req, unsigned int issue_flags)
spin_unlock(&files->file_lock);
goto err;
}
file = fdt->fd[close->fd];
file = rcu_dereference_protected(fdt->fd[close->fd],
lockdep_is_held(&files->file_lock));
if (!file || file->f_op == &io_uring_fops) {
spin_unlock(&files->file_lock);
file = NULL;