From 27cb748ee155c8f211b65ba08fa6685461f95c8a Mon Sep 17 00:00:00 2001
From: Morgan Phillips <winter2718@gmail.com>
Date: Thu, 28 Jan 2016 10:07:14 -0600
Subject: [PATCH] Bug 1238582 - Skip simulated OOM check in the case where
 we're growing within reserved space; r=Waldo

---
 mfbt/Vector.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mfbt/Vector.h b/mfbt/Vector.h
index 4461242a946..bf7531c70b7 100644
--- a/mfbt/Vector.h
+++ b/mfbt/Vector.h
@@ -972,7 +972,13 @@ Vector<T, N, AP>::growBy(size_t aIncr)
       return false;
     }
   } else if (aIncr + mLength > N) {
-    if (!allocPolicy().checkSimulatedOOM()) {
+    bool checkSimulatedOOM =
+#ifdef DEBUG
+    aIncr + mLength > mReserved;
+#else
+    true;
+#endif
+    if (checkSimulatedOOM && !allocPolicy().checkSimulatedOOM()) {
       return false;
     }
   }