From a09c094f1a0c8de5c9379dd1931b80c6b057c101 Mon Sep 17 00:00:00 2001
From: Woo Xie <woo@fb.com>
Date: Tue, 30 Jun 2015 09:21:08 -0700
Subject: [PATCH] check ReadCallback before using it

Summary: before the first setReadCallback(), the readCallback_ is nullptr.  Thanks @siyengar for pointing out this!

Reviewed By: @siyengar

Differential Revision: D2203489
---
 folly/io/async/AsyncSSLSocket.cpp | 2 +-
 folly/io/async/AsyncSSLSocket.h   | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/folly/io/async/AsyncSSLSocket.cpp b/folly/io/async/AsyncSSLSocket.cpp
index 9c59cce7..e3df3950 100644
--- a/folly/io/async/AsyncSSLSocket.cpp
+++ b/folly/io/async/AsyncSSLSocket.cpp
@@ -1073,7 +1073,7 @@ AsyncSSLSocket::handleConnect() noexcept {
 void AsyncSSLSocket::setReadCB(ReadCallback *callback) {
 #ifdef SSL_MODE_MOVE_BUFFER_OWNERSHIP
   // turn on the buffer movable in openssl
-  if (!isBufferMovable_ && readCallback_->isBufferMovable()) {
+  if (!isBufferMovable_ && callback != nullptr && callback->isBufferMovable()) {
     SSL_set_mode(ssl_, SSL_get_mode(ssl_) | SSL_MODE_MOVE_BUFFER_OWNERSHIP);
     isBufferMovable_ = true;
   }
diff --git a/folly/io/async/AsyncSSLSocket.h b/folly/io/async/AsyncSSLSocket.h
index 2cae50a4..fe72e8f9 100644
--- a/folly/io/async/AsyncSSLSocket.h
+++ b/folly/io/async/AsyncSSLSocket.h
@@ -656,6 +656,8 @@ class AsyncSSLSocket : public virtual AsyncSocket {
     return minWriteSize_;
   }
 
+  void setReadCB(ReadCallback* callback) override;
+
  private:
 
   void init();
@@ -673,7 +675,6 @@ class AsyncSSLSocket : public virtual AsyncSocket {
 
   // Inherit event notification methods from AsyncSocket except
   // the following.
-  void setReadCB(ReadCallback* callback) override;
   void prepareReadBuffer(void** buf, size_t* buflen) noexcept override;
   void handleRead() noexcept override;
   void handleWrite() noexcept override;
-- 
2.34.1