rbd: do a safe list traversal in rbd_img_request_submit()
It's possible that the reference to the object request dropped inside the loop in rbd_img_request_submit() will be the last one, in which case the content of the object pointer can't be trusted. Use a safe form of the object request list traversal to avoid problems. This resolves: http://tracker.ceph.com/issues/4705Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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