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Merge branch '4273-streamdns-eagain' into 'main'

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Resolve "crash while receiving 64 kiB message over TCP"

Closes #4273

See merge request isc-projects/bind9!8231
This commit is contained in:
Arаm Sаrgsyаn
2023-08-24 12:43:31 +00:00
parent 6b1ed14f17 a33dc921dc
commit edd9925e44
2 changed files with 21 additions and 7 deletions
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18
bin/tests/system/tcp/tests_tcp.py
View File

@@ -114,3 +114,21 @@ def test_close_wait(named_port):
msg = create_msg("a.example.", "A")
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
# GL #4273
def test_tcp_big(named_port):
with create_socket("10.53.0.7", named_port) as sock:
msg = dns.message.Message(id=0)
msg.flags = dns.flags.RD
msg.question.append(dns.rrset.from_text(dns.name.root, 0, 1, "URI"))
msg.additional.append(
dns.rrset.from_text(dns.name.root, 0, 1, "URI", "0 0 " + "b" * 65503)
)
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())
# Now check that the server is alive and well
msg = create_msg("a.example.", "A")
(sbytes, stime) = dns.query.send_tcp(sock, msg, timeout())
(response, rtime) = dns.query.receive_tcp(sock, timeout())

10
lib/isc/include/isc/dnsstream.h
View File

@@ -491,13 +491,9 @@ isc_dnsstream_assembler_incoming(isc_dnsstream_assembler_t *restrict dnsasm,
REQUIRE(dnsasm != NULL);
INSIST(!dnsasm->calling_cb);
if (buf_size == 0) {
INSIST(buf == NULL);
} else {
if (buf != NULL && buf_size > 0) {
size_t remaining;
INSIST(buf != NULL);
remaining = isc_buffer_remaininglength(&dnsasm->dnsbuf);
if (remaining == 0) {
@@ -525,7 +521,7 @@ isc_dnsstream_assembler_incoming(isc_dnsstream_assembler_t *restrict dnsasm,
* when receiving the next batch of data.
*/
return;
} else if (remaining == 1 && buf_size > 0) {
} else if (remaining == 1) {
/* Mostly the same case as above, but we have incomplete
* message length in the buffer and received at least
* one byte to complete it.
@@ -544,7 +540,7 @@ isc_dnsstream_assembler_incoming(isc_dnsstream_assembler_t *restrict dnsasm,
return;
}
if (buf_size > 0) {
if (unprocessed_size > 0) {
isc_buffer_putmem(dnsasm->current,
unprocessed_buf,
unprocessed_size);