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cm_work_handler() can access cm_id_priv after it drops its reference by calling iwch_deref_id(), which might cause it to be freed. The fix is to look at whether IWCM_F_CALLBACK_DESTROY is set _before_ dropping the reference. Then if it was set, free the cm_id on this thread. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>