From cc826ae8baabae99a147d57ee2216e4cc4c2eaf6 Mon Sep 17 00:00:00 2001
From: Youenn Fablet <youenn@apple.com>
Date: Thu, 25 Apr 2019 16:39:31 -0700
Subject: [PATCH] fix-197301

---
 .../libwebrtc/Source/webrtc/rtc_base/physicalsocketserver.cc    | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Source/ThirdParty/libwebrtc/Source/webrtc/rtc_base/physicalsocketserver.cc b/Source/ThirdParty/libwebrtc/Source/webrtc/rtc_base/physicalsocketserver.cc
index 7448a7e0427..91cb7da8366 100644
--- a/Source/ThirdParty/libwebrtc/Source/webrtc/rtc_base/physicalsocketserver.cc
+++ b/Source/ThirdParty/libwebrtc/Source/webrtc/rtc_base/physicalsocketserver.cc
@@ -1424,6 +1424,8 @@ bool PhysicalSocketServer::WaitSelect(int cmsWait, bool process_io) {
         // "select"ing a file descriptor that is equal to or larger than
         // FD_SETSIZE will result in undefined behavior.
         RTC_DCHECK_LT(fd, FD_SETSIZE);
+        if (fd < 0 || fd >= FD_SETSIZE)
+            continue;
         if (fd > fdmax)
           fdmax = fd;
 
-- 
2.20.1 (Apple Git-116)