From cea77b76b3fef912bd79e777f97d353aa50474b6 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Sun, 10 Nov 2019 21:59:52 -0500
Subject: Bug 1333038 - Use 'modern' pointers to fix crash due to
 nsMsgLineStreamBuffer object being deleted while still in use.

Suspected "use after free" in nsMsgLineStreamBuffer::ReadNextLine() leading to crash since object may be destroyed while still in use on another thread.

Tag #1273
---
 mailnews/local/src/nsMailboxProtocol.cpp | 4 ----
 mailnews/local/src/nsMailboxProtocol.h   | 2 +-
 mailnews/local/src/nsPop3Protocol.cpp    | 4 ----
 mailnews/local/src/nsPop3Protocol.h      | 2 +-
 4 files changed, 2 insertions(+), 10 deletions(-)

(limited to 'mailnews/local/src')

diff --git a/mailnews/local/src/nsMailboxProtocol.cpp b/mailnews/local/src/nsMailboxProtocol.cpp
index fad77aa93..0148133b3 100644
--- a/mailnews/local/src/nsMailboxProtocol.cpp
+++ b/mailnews/local/src/nsMailboxProtocol.cpp
@@ -50,8 +50,6 @@ PRLogModuleInfo *MAILBOX;
 nsMailboxProtocol::nsMailboxProtocol(nsIURI * aURI)
     : nsMsgProtocol(aURI)
 {
-  m_lineStreamBuffer =nullptr;
-
   // initialize the pr log if it hasn't been initialiezed already
   if (!MAILBOX)
     MAILBOX = PR_NewLogModule("MAILBOX");
@@ -59,8 +57,6 @@ nsMailboxProtocol::nsMailboxProtocol(nsIURI * aURI)
 
 nsMailboxProtocol::~nsMailboxProtocol()
 {
-  // free our local state
-  delete m_lineStreamBuffer;
 }
 
 nsresult nsMailboxProtocol::OpenMultipleMsgTransport(uint64_t offset, int32_t size)
diff --git a/mailnews/local/src/nsMailboxProtocol.h b/mailnews/local/src/nsMailboxProtocol.h
index e030c8d7c..36c892069 100644
--- a/mailnews/local/src/nsMailboxProtocol.h
+++ b/mailnews/local/src/nsMailboxProtocol.h
@@ -74,7 +74,7 @@ private:
   nsCOMPtr<nsIStreamListener> m_mailboxParser;
 
   // Local state for the current operation
-  nsMsgLineStreamBuffer   * m_lineStreamBuffer; // used to efficiently extract lines from the incoming data stream
+  RefPtr<nsMsgLineStreamBuffer> m_lineStreamBuffer; // used to efficiently extract lines from the incoming data stream
 
   // Generic state information -- What state are we in? What state do we want to go to
   // after the next response? What was the last response code? etc.
diff --git a/mailnews/local/src/nsPop3Protocol.cpp b/mailnews/local/src/nsPop3Protocol.cpp
index 825f45ab3..5d9d9145a 100644
--- a/mailnews/local/src/nsPop3Protocol.cpp
+++ b/mailnews/local/src/nsPop3Protocol.cpp
@@ -451,7 +451,6 @@ nsPop3Protocol::nsPop3Protocol(nsIURI* aURL)
   m_totalFolderSize(0),
   m_totalDownloadSize(0),
   m_totalBytesReceived(0),
-  m_lineStreamBuffer(nullptr),
   m_pop3ConData(nullptr)
 {
 }
@@ -590,9 +589,6 @@ void nsPop3Protocol::Cleanup()
   FreeMsgInfo();
   PR_Free(m_pop3ConData->only_uidl);
   PR_Free(m_pop3ConData);
-
-  delete m_lineStreamBuffer;
-  m_lineStreamBuffer = nullptr;
 }
 
 void nsPop3Protocol::SetCapFlag(uint32_t flag)
diff --git a/mailnews/local/src/nsPop3Protocol.h b/mailnews/local/src/nsPop3Protocol.h
index a332eae84..43a8aa4e8 100644
--- a/mailnews/local/src/nsPop3Protocol.h
+++ b/mailnews/local/src/nsPop3Protocol.h
@@ -318,7 +318,7 @@ private:
   nsCOMPtr<nsIPop3Sink> m_nsIPop3Sink;
   nsCOMPtr<nsIPop3IncomingServer> m_pop3Server;
 
-  nsMsgLineStreamBuffer   * m_lineStreamBuffer; // used to efficiently extract lines from the incoming data stream
+  RefPtr<nsMsgLineStreamBuffer> m_lineStreamBuffer; // used to efficiently extract lines from the incoming data stream
   Pop3ConData* m_pop3ConData;
   void FreeMsgInfo();
   void Abort();
-- 
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