From 6b9261218597802079ae99bdd11b3739e97e3bb6 Mon Sep 17 00:00:00 2001
From: Gleb Balykov <g.balykov@samsung.com>
Date: Thu, 17 Dec 2020 21:28:45 +0300
Subject: [PATCH] Fix memory errors related to EventPipe setup with
 COMPlus_EventPipeConfig (#44068)

- XplatEventLoggerConfiguration configuration owns strings passed to EventPipeProviderConfiguration pProviders, and configurations are freed before pProviders are copied to EventPipeSessionProvider
  - NewArrayHolder shoud be used for pProviders to fix memory leak (delete[] instead of delete)
---
 src/coreclr/vm/eventpipe.cpp | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/coreclr/vm/eventpipe.cpp b/src/coreclr/vm/eventpipe.cpp
index 77855ce..7673ca4 100644
--- a/src/coreclr/vm/eventpipe.cpp
+++ b/src/coreclr/vm/eventpipe.cpp
@@ -169,7 +169,8 @@ void EventPipe::EnableViaEnvironmentVariables()
         int providerCnt = 0;
 
         // Create EventPipeProviderConfiguration and start tracing.
-        NewHolder<EventPipeProviderConfiguration> pProviders = nullptr;
+        NewArrayHolder<EventPipeProviderConfiguration> pProviders = nullptr;
+        NewArrayHolder<XplatEventLoggerConfiguration> pConfigurations = nullptr;
 
         // If COMPlus_EnableEventPipe is set to 1 but no configuration was specified, enable EventPipe session
         // with the default provider configurations.
@@ -183,7 +184,6 @@ void EventPipe::EnableViaEnvironmentVariables()
         }
         else
         {
-            auto configuration = XplatEventLoggerConfiguration();
             // Count how many providers there are to parse
             static WCHAR comma = W(',');
             while (*configToParse != '\0')
@@ -198,25 +198,28 @@ void EventPipe::EnableViaEnvironmentVariables()
             }
             configToParse = eventpipeConfig;
             pProviders = new EventPipeProviderConfiguration[providerCnt];
+            pConfigurations = new XplatEventLoggerConfiguration[providerCnt];
             int i = 0;
             while (*configToParse != '\0')
             {
                 auto end = wcschr(configToParse, comma);
-                configuration.Parse(configToParse);
+                pConfigurations[i].Parse(configToParse);
 
                 // if we find any invalid configuration, do not trace.
-                if (!configuration.IsValid())
+                if (!pConfigurations[i].IsValid())
                 {
                     return;
                 }
 
-                pProviders[i++] = EventPipeProviderConfiguration(
-                    configuration.GetProviderName(),
-                    configuration.GetEnabledKeywordsMask(),
-                    configuration.GetLevel(),
-                    configuration.GetArgument()
+                pProviders[i] = EventPipeProviderConfiguration(
+                    pConfigurations[i].GetProviderName(),
+                    pConfigurations[i].GetEnabledKeywordsMask(),
+                    pConfigurations[i].GetLevel(),
+                    pConfigurations[i].GetArgument()
                 );
 
+                ++i;
+
                 if (end == nullptr)
                 {
                     break;
-- 
2.7.4