From: Vitaly Buka <vitalybuka@google.com>
Date: Thu, 3 Jun 2021 07:06:45 +0000 (-0700)
Subject: [NFC][scudo] Avoid integer overflow in test
X-Git-Tag: llvmorg-14-init~4997
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b40908e639b6075c77d7b2a990a2a273a39f4102;p=platform%2Fupstream%2Fllvm.git

[NFC][scudo] Avoid integer overflow in test

releasePagesToOS may shrink RSS below the value stored on start.
---

diff --git a/compiler-rt/lib/scudo/standalone/tests/common_test.cpp b/compiler-rt/lib/scudo/standalone/tests/common_test.cpp
index d8184a7..711e3b2 100644
--- a/compiler-rt/lib/scudo/standalone/tests/common_test.cpp
+++ b/compiler-rt/lib/scudo/standalone/tests/common_test.cpp
@@ -37,16 +37,16 @@ TEST(ScudoCommonTest, SKIP_ON_FUCHSIA(ResidentMemorySize)) {
   MapPlatformData Data = {};
   void *P = map(nullptr, Size, "ResidentMemorySize", 0, &Data);
   ASSERT_NE(nullptr, P);
-  EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
+  EXPECT_LT(getResidentMemorySize(), OnStart + Threshold);
 
   memset(P, 1, Size);
-  EXPECT_GT(getResidentMemorySize() - OnStart, Size - Threshold);
+  EXPECT_GT(getResidentMemorySize(), OnStart + Size - Threshold);
 
   releasePagesToOS((uptr)P, 0, Size, &Data);
-  EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
+  EXPECT_LT(getResidentMemorySize(), OnStart + Threshold);
 
   memset(P, 1, Size);
-  EXPECT_GT(getResidentMemorySize() - OnStart, Size - Threshold);
+  EXPECT_GT(getResidentMemorySize(), OnStart + Size - Threshold);
 
   unmap(P, Size, 0, &Data);
 }