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net: ethernet: Set dest MAC address for IPv4 mcast

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If the ethernet packet destination MAC address is NULL when sending
IPv4 multicast or broadcast packet, then we must set it as otherwise
we might to access NULL pointer data.

Fixes #1544

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2017-09-20 09:34:47 +03:00
parent 2e50126f55
commit 9369538642
1 changed files with 6 additions and 2 deletions
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8
subsys/net/ip/l2/ethernet.c
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@ -194,9 +194,13 @@ static enum net_verdict ethernet_send(struct net_if *iface,
struct net_pkt *arp_pkt;
if (check_if_dst_is_broadcast_or_mcast(iface, pkt)) {
struct net_eth_addr *dst = &NET_ETH_HDR(pkt)->dst;
if (!net_pkt_ll_dst(pkt)->addr) {
struct net_eth_addr *dst;
dst = &NET_ETH_HDR(pkt)->dst;
net_pkt_ll_dst(pkt)->addr = (u8_t *)dst->addr;
}
net_pkt_ll_dst(pkt)->addr = (u8_t *)dst->addr;
goto setup_hdr;
}