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net: icmpv4: Drop ICMPv4 packet with zero checksum

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ICMPv4 checksum is not optional and thus cannot be zero. Hence, drop
packet with invalid zero ICMPv4 checksum.

Signed-off-by: Ruslan Mstoi <ruslan.mstoi@intel.com>
This commit is contained in:
Ruslan Mstoi 2018-10-24 14:38:34 +03:00 committed by Jukka Rissanen
parent 9e895acf4e
commit de78a7af28
1 changed files with 5 additions and 0 deletions
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5
subsys/net/ip/icmpv4.c
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@ -340,6 +340,11 @@ enum net_verdict net_icmpv4_input(struct net_pkt *pkt)
return NET_DROP;
}
if (!icmp_hdr.chksum) {
NET_DBG("Invalid zero ICMPv4 checksum - dropping");
goto drop;
}
if (net_is_ipv4_addr_bcast(net_pkt_iface(pkt),
&NET_IPV4_HDR(pkt)->dst)) {
if (!IS_ENABLED(CONFIG_NET_ICMPV4_ACCEPT_BROADCAST) ||