commit f2abf5b60c289103d8661b8e54b3d3aee43a4aaf Author: Arlo Breault arlolra@gmail.com Date: Wed Mar 14 00:15:13 2018 -0400

Try to protect against crash from dereferencing a NULL in go-proxy

Follow up to ff8f385

Similar to c834c76 --- proxy-go/snowflake.go | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/proxy-go/snowflake.go b/proxy-go/snowflake.go index b3b97b3..a12cfb2 100644 --- a/proxy-go/snowflake.go +++ b/proxy-go/snowflake.go @@ -71,7 +71,9 @@ func (c *webRTCConn) Read(b []byte) (int, error) { func (c *webRTCConn) Write(b []byte) (int, error) { // log.Printf("webrtc Write %d %+q", len(b), string(b)) log.Printf("Write %d bytes --> WebRTC", len(b)) - c.dc.Send(b) + if c.dc != nil { + c.dc.Send(b) + } return len(b), nil }

@@ -254,12 +256,15 @@ func makePeerConnectionFromOffer(sdp *webrtc.SessionDescription, config *webrtc.

pr, pw := io.Pipe()

+ conn := &webRTCConn{pc: pc, dc: dc, pr: pr} + dc.OnOpen = func() { log.Println("OnOpen channel") } dc.OnClose = func() { log.Println("OnClose channel") pw.Close() + conn.dc = nil pc.DeleteDataChannel(dc) } dc.OnMessage = func(msg []byte) { @@ -273,7 +278,6 @@ func makePeerConnectionFromOffer(sdp *webrtc.SessionDescription, config *webrtc. } }

- conn := &webRTCConn{pc: pc, dc: dc, pr: pr} go datachannelHandler(conn, conn.RemoteAddr()) }