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fix race condition in GetStream in outgoing streams map

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This commit is contained in:
Marten Seemann 2018-02-22 09:21:59 +08:00
parent 77a4bf17ca
commit 4fa68b0788
6 changed files with 15 additions and 3 deletions
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3
streams_map_incoming_bidi.go
View file

@ -85,6 +85,9 @@ func (m *incomingBidiStreamsMap) GetOrOpenStream(id protocol.StreamID) (streamI,
m.mutex.RUnlock()
m.mutex.Lock()
// no need to check the two error conditions from above again
// * maxStream can only increase, so if the id was valid before, it definitely is valid now
// * highestStream is only modified by this function
var start protocol.StreamID
if m.highestStream == 0 {
start = m.nextStream

3
streams_map_incoming_generic.go
View file

@ -83,6 +83,9 @@ func (m *incomingItemsMap) GetOrOpenStream(id protocol.StreamID) (item, error) {
m.mutex.RUnlock()
m.mutex.Lock()
// no need to check the two error conditions from above again
// * maxStream can only increase, so if the id was valid before, it definitely is valid now
// * highestStream is only modified by this function
var start protocol.StreamID
if m.highestStream == 0 {
start = m.nextStream

3
streams_map_incoming_uni.go
View file

@ -85,6 +85,9 @@ func (m *incomingUniStreamsMap) GetOrOpenStream(id protocol.StreamID) (receiveSt
m.mutex.RUnlock()
m.mutex.Lock()
// no need to check the two error conditions from above again
// * maxStream can only increase, so if the id was valid before, it definitely is valid now
// * highestStream is only modified by this function
var start protocol.StreamID
if m.highestStream == 0 {
start = m.nextStream

3
streams_map_outgoing_bidi.go
View file

@ -85,10 +85,11 @@ func (m *outgoingBidiStreamsMap) openStreamImpl() (streamI, error) {
}
func (m *outgoingBidiStreamsMap) GetStream(id protocol.StreamID) (streamI, error) {
m.mutex.RLock()
if id >= m.nextStream {
m.mutex.RUnlock()
return nil, qerr.Error(qerr.InvalidStreamID, fmt.Sprintf("peer attempted to open stream %d", id))
}
m.mutex.RLock()
s := m.streams[id]
m.mutex.RUnlock()
return s, nil

3
streams_map_outgoing_generic.go
View file

@ -86,10 +86,11 @@ func (m *outgoingItemsMap) openStreamImpl() (item, error) {
}
func (m *outgoingItemsMap) GetStream(id protocol.StreamID) (item, error) {
m.mutex.RLock()
if id >= m.nextStream {
m.mutex.RUnlock()
return nil, qerr.Error(qerr.InvalidStreamID, fmt.Sprintf("peer attempted to open stream %d", id))
}
m.mutex.RLock()
s := m.streams[id]
m.mutex.RUnlock()
return s, nil

3
streams_map_outgoing_uni.go
View file

@ -85,10 +85,11 @@ func (m *outgoingUniStreamsMap) openStreamImpl() (sendStreamI, error) {
}
func (m *outgoingUniStreamsMap) GetStream(id protocol.StreamID) (sendStreamI, error) {
m.mutex.RLock()
if id >= m.nextStream {
m.mutex.RUnlock()
return nil, qerr.Error(qerr.InvalidStreamID, fmt.Sprintf("peer attempted to open stream %d", id))
}
m.mutex.RLock()
s := m.streams[id]
m.mutex.RUnlock()
return s, nil