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ntp: ignore truncated messages

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Don't waste time with processing messages that don't fit in the receive
buffer as they most likely wouldn't pass the format check due to an
invalid length of an extension field.
This commit is contained in:
Miroslav Lichvar
2016-11-15 12:10:50 +01:00
parent 5b2caf48dc
commit 8823e2b064
1 changed files with 6 additions and 0 deletions
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6
ntp_io.c
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@@ -598,6 +598,12 @@ process_message(struct msghdr *hdr, int length, int sock_fd)
local_addr.sock_fd = sock_fd;
if_index = -1;
if (hdr->msg_flags & MSG_TRUNC) {
DEBUG_LOG(LOGF_NtpIO, "Received truncated message from %s:%d",
UTI_IPToString(&remote_addr.ip_addr), remote_addr.port);
return;
}
for (cmsg = CMSG_FIRSTHDR(hdr); cmsg; cmsg = CMSG_NXTHDR(hdr, cmsg)) {
#ifdef HAVE_IN_PKTINFO
if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO) {