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H2: remove a rather useless limit on the number of streams

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SETTINGS for max concurrect number of streams is 'one direction' - this
is how our peer conveys the possible number of streams _we_ can open,
not _them_. If they choose to have it unlimited - let it be so.

It's possible to send 0 as maximum number, also, it's possible to
reduce the maximum compared to initial at some point - then I have
to avoid integer overflows.

Fixes: QTBUG-94470
Change-Id: Ia02247acbaedd70998a4cab02082ba10f45cf78c
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
(cherry picked from commit 46940ca73791e87e2366b80ac2884b3bcce716ce)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Timur Pocheptsov 2021-06-14 14:38:27 +02:00 committed by Qt Cherry-pick Bot
parent 635dff376e
commit a6a2c56c96
2 changed files with 3 additions and 10 deletions
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3
src/network/access/http2/http2protocol_p.h
View File

@ -133,9 +133,6 @@ enum Http2PredefinedParameters
maxPayloadSize = (1 << 24) - 1, // HTTP/2 6.5.2
defaultSessionWindowSize = 65535, // HTTP/2 6.5.2
// Using 1000 (rather arbitrarily), just to
// impose *some* upper limit:
maxPeerConcurrentStreams = 1000,
maxConcurrentStreams = 100 // HTTP/2, 6.5.2
};

10
src/network/access/qhttp2protocolhandler.cpp
View File

@ -393,7 +393,8 @@ bool QHttp2ProtocolHandler::sendRequest()
initReplyFromPushPromise(message, key);
}
const auto streamsToUse = std::min<quint32>(maxConcurrentStreams - activeStreams.size(),
const auto streamsToUse = std::min<quint32>(maxConcurrentStreams > activeStreams.size()
? maxConcurrentStreams - activeStreams.size() : 0,
requests.size());
auto it = requests.begin();
for (quint32 i = 0; i < streamsToUse; ++i) {
@ -1085,13 +1086,8 @@ bool QHttp2ProtocolHandler::acceptSetting(Http2::Settings identifier, quint32 ne
QMetaObject::invokeMethod(this, "resumeSuspendedStreams", Qt::QueuedConnection);
}
if (identifier == Settings::MAX_CONCURRENT_STREAMS_ID) {
if (newValue > maxPeerConcurrentStreams) {
connectionError(PROTOCOL_ERROR, "SETTINGS invalid number of concurrent streams");
return false;
}
if (identifier == Settings::MAX_CONCURRENT_STREAMS_ID)
maxConcurrentStreams = newValue;
}
if (identifier == Settings::MAX_FRAME_SIZE_ID) {
if (newValue < Http2::minPayloadLimit || newValue > Http2::maxPayloadSize) {