[#4243] Fix memory leak in AudioSrtpSession

sflphone-common/src/audio/audiortp/AudioSrtpSession.cpp

@@ -58,10 +58,25 @@ AudioSrtpSession::AudioSrtpSession (ManagerImpl * manager, SIPCall * sipcall) :
         _localMasterSaltLength (0),
         _remoteMasterKeyLength (0),
         _remoteMasterSaltLength (0),
+        _remoteCryptoCtx (NULL),
+        _localCryptoCtx (NULL),
         _remoteOfferIsSet (false)
 {
 }
 
+AudioSrtpSession::~AudioSrtpSession()
+{
+    if (_remoteCryptoCtx) {
+        delete _remoteCryptoCtx;
+        _remoteCryptoCtx = NULL;
+    }
+
+    if (_localCryptoCtx) {
+        delete _localCryptoCtx;
+        _localCryptoCtx = NULL;
+    }
+}
+
 void AudioSrtpSession::initLocalCryptoInfo()
 {
     _debug ("AudioSrtp: Set cryptographic info for this rtp session");
@@ -241,6 +256,11 @@ void AudioSrtpSession::initializeRemoteCryptoContext (void)
 
     CryptoSuiteDefinition crypto = sfl::CryptoSuites[_remoteCryptoSuite];
 
+    if (_remoteCryptoCtx) {
+        delete _remoteCryptoCtx;
+        _remoteCryptoCtx = NULL;
+    }
+
     _remoteCryptoCtx = new ost::CryptoContext (0x0,
             0,                               // roc,
             0L,                              // keydr,
@@ -263,6 +283,11 @@ void AudioSrtpSession::initializeLocalCryptoContext (void)
 
     CryptoSuiteDefinition crypto = sfl::CryptoSuites[_localCryptoSuite];
 
+    if (_localCryptoCtx) {
+        delete _localCryptoCtx;
+        _localCryptoCtx = NULL;
+    }
+
     _localCryptoCtx = new ost::CryptoContext (OutgoingDataQueue::getLocalSSRC(),
             0,                               // roc,
             0L,                              // keydr,

sflphone-common/src/audio/audiortp/AudioSrtpSession.h

@@ -83,6 +83,8 @@ class AudioSrtpSession : public ost::SymmetricRTPSession, public AudioRtpSession
          */
         AudioSrtpSession (ManagerImpl * manager, SIPCall * sipcall);
 
+        ~AudioSrtpSession();
+
         /**
          * Used to get sdp crypto header to be included in sdp session. This
          * method must be called befor setRemoteCryptoInfo in case of an