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F-13971: Ignore zero-length datagrams in DTLS demux server #634

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F-13971: Ignore zero-length datagrams in DTLS demux server #634

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9 changes: 8 additions & 1 deletion dtls/server-dtls-demux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -316,8 +316,15 @@ int main(void)
struct ConnList *conn = NULL;

sz = recvfrom(listenfd.fd, readBuf, sizeof(readBuf), 0, &peerAddr, &peerAddrLen);
if (sz <= 0)
if (sz < 0) {
if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
continue;
perror("recvfrom");
goto cleanup;
}
/* Empty datagrams are valid UDP. Drop them. */
if (sz == 0)
continue;

/* find ssl object */
conn = findConn(connList, readBuf, sz, &peerAddr, peerAddrLen);
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