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rem_ref() calls iwcm_deref_id(), which will wake up any blockers on cm_id_priv->destroy_comp if the refcnt hits 0. That will unblock someone in iw_destroy_cm_id() which will free the cmid. If that happens before rem_ref() calls test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags), then the test_bit() will touch freed memory. The fix is to read the bit first, then deref. We should never be in iw_destroy_cm_id() with IWCM_F_CALLBACK_DESTROY set, and there is a BUG_ON() to make sure of that. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Roland Dreier <roland@purestorage.com>