In iwm(4), set mbuf pointers to NULL after freeing mbufs.

ok phessler mpi zhuk

diff --git a/sys/dev/pci/if_iwm.c b/sys/dev/pci/if_iwm.c
index 98fafd7..7f7c26b 100644 (file)
--- a/sys/dev/pci/if_iwm.c
+++ b/sys/dev/pci/if_iwm.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_iwm.c,v 1.53 2015/10/06 09:12:00 stsp Exp $        */
+/*     $OpenBSD: if_iwm.c,v 1.54 2015/10/10 19:04:57 stsp Exp $        */
 
 /*
  * Copyright (c) 2014 genua mbh <info@genua.de>
@@ -1062,6 +1062,7 @@ iwm_free_rx_ring(struct iwm_softc *sc, struct iwm_rx_ring *ring)
                            data->map->dm_mapsize, BUS_DMASYNC_POSTREAD);
                        bus_dmamap_unload(sc->sc_dmat, data->map);
                        m_freem(data->m);
+                       data->m = NULL;
                }
                if (data->map != NULL)
                        bus_dmamap_destroy(sc->sc_dmat, data->map);
@@ -1169,6 +1170,7 @@ iwm_free_tx_ring(struct iwm_softc *sc, struct iwm_tx_ring *ring)
                            data->map->dm_mapsize, BUS_DMASYNC_POSTWRITE);
                        bus_dmamap_unload(sc->sc_dmat, data->map);
                        m_freem(data->m);
+                       data->m = NULL;
                }
                if (data->map != NULL)
                        bus_dmamap_destroy(sc->sc_dmat, data->map);