[src/trunk]: src/sys/arch/arm/sunxi Protect ether_multi list

[ozaki-r <ozaki-r%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/df14e7bba811
branches:  trunk
changeset: 998945:df14e7bba811
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Thu May 09 01:46:37 2019 +0000

description:
Protect ether_multi list

The list can be racy if NET_MPSAFE is enabled and the driver is executed without
KERNEL_LOCK.

Fix PR 54153

diffstat:

 sys/arch/arm/sunxi/sunxi_emac.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (34 lines):

diff -r fe5f150edf8b -r df14e7bba811 sys/arch/arm/sunxi/sunxi_emac.c
--- a/sys/arch/arm/sunxi/sunxi_emac.c   Wed May 08 22:01:47 2019 +0000
+++ b/sys/arch/arm/sunxi/sunxi_emac.c   Thu May 09 01:46:37 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: sunxi_emac.c,v 1.25 2019/04/22 14:53:51 maya Exp $ */
+/* $NetBSD: sunxi_emac.c,v 1.26 2019/05/09 01:46:37 ozaki-r Exp $ */
 
 /*-
  * Copyright (c) 2016-2017 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -33,7 +33,7 @@
 #include "opt_net_mpsafe.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sunxi_emac.c,v 1.25 2019/04/22 14:53:51 maya Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sunxi_emac.c,v 1.26 2019/05/09 01:46:37 ozaki-r Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -543,6 +543,7 @@
                hash[0] = hash[1] = ~0;
        } else {
                val |= HASH_MULTICAST;
+               ETHER_LOCK(&sc->ec);
                ETHER_FIRST_MULTI(step, &sc->ec, enm);
                while (enm != NULL) {
                        crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN);
@@ -553,6 +554,7 @@
                        hash[hashreg] |= (1 << hashbit);
                        ETHER_NEXT_MULTI(step, enm);
                }
+               ETHER_UNLOCK(&sc->ec);
        }
 
        /* Write our unicast address */