[src/trunk]: src/sys/dev/pci set NULL after free.

[nonaka <nonaka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0229ef74e97a
branches:  trunk
changeset: 820443:0229ef74e97a
user:      nonaka <nonaka%NetBSD.org@localhost>
date:      Tue Jan 10 04:27:04 2017 +0000

description:
set NULL after free.

diffstat:

 sys/dev/pci/if_iwm.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 8508f09ee9db -r 0229ef74e97a sys/dev/pci/if_iwm.c
--- a/sys/dev/pci/if_iwm.c      Tue Jan 10 04:27:02 2017 +0000
+++ b/sys/dev/pci/if_iwm.c      Tue Jan 10 04:27:04 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_iwm.c,v 1.56 2017/01/09 12:45:49 nonaka Exp $       */
+/*     $NetBSD: if_iwm.c,v 1.57 2017/01/10 04:27:04 nonaka Exp $       */
 /*     OpenBSD: if_iwm.c,v 1.148 2016/11/19 21:07:08 stsp Exp  */
 #define IEEE80211_NO_HT
 /*
@@ -107,7 +107,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_iwm.c,v 1.56 2017/01/09 12:45:49 nonaka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_iwm.c,v 1.57 2017/01/10 04:27:04 nonaka Exp $");
 
 #include <sys/param.h>
 #include <sys/conf.h>
@@ -1332,6 +1332,7 @@
                            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);