[WebRTC] Port some upstream sctp fixes

- add SCTP auth token boundary check.
- turn off SCTP auth and address reconfiguration.

2 files changed, 22 insertions, 7 deletions

diff --git a/netwerk/sctp/datachannel/DataChannel.cpp b/netwerk/sctp/datachannel/DataChannel.cpp
index 19be43d1c..4797353ca 100644
--- a/netwerk/sctp/datachannel/DataChannel.cpp
+++ b/netwerk/sctp/datachannel/DataChannel.cpp
@@ -354,6 +354,13 @@ DataChannelConnection::Init(unsigned short aPort, uint16_t aNumStreams, bool aUs
       usrsctp_sysctl_set_sctp_blackhole(2);
       // ECN is currently not supported by the Firefox code
       usrsctp_sysctl_set_sctp_ecn_enable(0);
+
+      // Disabling authentication and dynamic address reconfiguration as neither
+      // of them are used for data channel and only result in additional code
+      // paths being used.
+      usrsctp_sysctl_set_sctp_asconf_enable(0);
+      usrsctp_sysctl_set_sctp_auth_enable(0);
+
       sctp_initialized = true;
 
       RefPtr<DataChannelShutdown> shutdown = new DataChannelShutdown();
diff --git a/netwerk/sctp/src/netinet/sctp_input.c b/netwerk/sctp/src/netinet/sctp_input.c
index 54f2f9ba3..1301b430c 100755
--- a/netwerk/sctp/src/netinet/sctp_input.c
+++ b/netwerk/sctp/src/netinet/sctp_input.c
@@ -2073,7 +2073,7 @@ sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 	int init_offset, initack_offset, initack_limit;
 	int retval;
 	int error = 0;
-	uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
+	uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 	struct socket *so;
 
@@ -2264,8 +2264,12 @@ sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 	if (auth_skipped) {
 		struct sctp_auth_chunk *auth;
 
-		auth = (struct sctp_auth_chunk *)
-		    sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
+		if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
+			auth = (struct sctp_auth_chunk *)
+				sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
+		} else {
+			auth = NULL;
+		}
 		if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
 			/* auth HMAC failed, dump the assoc and packet */
 			SCTPDBG(SCTP_DEBUG_AUTH1,
@@ -4655,11 +4659,15 @@ sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
 			if (auth_skipped && (stcb != NULL)) {
 				struct sctp_auth_chunk *auth;
 
-				auth = (struct sctp_auth_chunk *)
-					sctp_m_getptr(m, auth_offset,
+				if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
+					auth = (struct sctp_auth_chunk *)
+						sctp_m_getptr(m, auth_offset,
 						      auth_len, chunk_buf);
-				got_auth = 1;
-				auth_skipped = 0;
+					got_auth = 1;
+					auth_skipped = 0;
+				} else {
+					auth = NULL;
+				}
 				if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
 								       auth_offset)) {
 					/* auth HMAC failed so dump it */