io_uring: Fix use of XArray in __io_uring_files_cancel
commit ce765372 upstream. We have to drop the lock during each iteration, so there's no advantage to using the advanced API. Convert this to a standard xa_for_each() loop. Reported-by: <syzbot+27c12725d8ff0bfe1a13@syzkaller.appspotmail.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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