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fix(dhcpv4): panic when parsing address #843

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Sep 20, 2023
Merged

fix(dhcpv4): panic when parsing address #843

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7 changes: 6 additions & 1 deletion src/wire/dhcpv4.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -788,13 +788,18 @@ impl<'a> Repr<'a> {
(field::OPT_DOMAIN_NAME_SERVER, _) => {
let mut servers = Vec::new();
const IP_ADDR_BYTE_LEN: usize = 4;
for chunk in data.chunks(IP_ADDR_BYTE_LEN) {
let mut addrs = data.chunks_exact(IP_ADDR_BYTE_LEN);
for chunk in &mut addrs {
// We ignore push failures because that will only happen
// if we attempt to push more than 4 addresses, and the only
// solution to that is to support more addresses.
servers.push(Ipv4Address::from_bytes(chunk)).ok();
}
dns_servers = Some(servers);

if !addrs.remainder().is_empty() {
net_trace!("DHCP domain name servers contained invalid address");
}
}
_ => {}
}
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