Fix integer overflow in unittest.

base/sys_info_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include "base/environment.h"
 #include "base/files/file_util.h"
 #include "base/process/process_metrics.h"
 #include "base/sys_info.h"
@@ skipping 25 matching lines @@
   // Note: info is in _K_bytes.
   SystemMemoryInfoKB info;
   ASSERT_TRUE(GetSystemMemoryInfo(&info));
   EXPECT_GT(info.free, 0);
 
   if (info.available != 0) {
     // If there is MemAvailable from kernel.
     EXPECT_LT(info.available, info.total);
     const int64_t amount = SysInfo::AmountOfAvailablePhysicalMemory(info);
     // We aren't actually testing that it's correct, just that it's sane.
-    EXPECT_GT(amount, info.free * 1024);
-    EXPECT_LT(amount, info.available * 1024);
+    EXPECT_GT(amount, static_cast<int64_t>(info.free) * 1024);
+    EXPECT_LT(amount / 1024, info.available);
     // Simulate as if there is no MemAvailable.
     info.available = 0;
   }
 
   // There is no MemAvailable. Check the fallback logic.
   const int64_t amount = SysInfo::AmountOfAvailablePhysicalMemory(info);
   // We aren't actually testing that it's correct, just that it's sane.
-  EXPECT_GT(amount, info.free * 1024);
-  EXPECT_LT(amount, info.total * 1024);
+  EXPECT_GT(amount, static_cast<int64_t>(info.free) * 1024);
+  EXPECT_LT(amount / 1024, info.total);
 }
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
 
 TEST_F(SysInfoTest, AmountOfFreeDiskSpace) {
   // We aren't actually testing that it's correct, just that it's sane.
   FilePath tmp_path;
   ASSERT_TRUE(GetTempDir(&tmp_path));
   EXPECT_GE(SysInfo::AmountOfFreeDiskSpace(tmp_path), 0) << tmp_path.value();
 }
 
@@ skipping 121 matching lines @@
   EXPECT_EQ("glimmer", SysInfo::GetStrippedReleaseBoard());
 
   const char* kLsbRelease2 = "CHROMEOS_RELEASE_BOARD=glimmer-signed-mp-v4keys";
   SysInfo::SetChromeOSVersionInfoForTest(kLsbRelease2, Time());
   EXPECT_EQ("glimmer", SysInfo::GetStrippedReleaseBoard());
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace base