Program: 7118
Project: 7118
Buggy source:
public String execute(String instruction){
  JSONObject fileData=null;
switch (getCommand(instruction)) {
case REACHABLE_COMMAND:
    int service=RadioInfo.getActiveWAFs();
  int reachability=NOT_REACHABLE;
if ((service & RadioInfo.WAF_3GPP) != 0 || (service & RadioInfo.WAF_CDMA) != 0 || (service & RadioInfo.WAF_IDEN) != 0) {
  reachability=REACHABLE_VIA_CARRIER_DATA_NETWORK;
}
if ((service & RadioInfo.WAF_WLAN) != 0) {
reachability=REACHABLE_VIA_WIFI_NETWORK;
}
return "String_Node_Str" + reachability + "String_Node_Str"+ reachability+ "String_Node_Str";
case XHR_UPLOAD_COMMAND:
int tildaIndex=instruction.lastIndexOf('~');
try {
JSONObject fileDetails=new JSONObject(instruction.substring(tildaIndex + 1));
instruction=instruction.substring(0,tildaIndex);
String filePath=fileDetails.getString("String_Node_Str");
String loggedinUser=fileDetails.getString("String_Node_Str");
fileData=readFileData(filePath);
String fileTargetPath=fileDetails.getString("String_Node_Str") + "String_Node_Str" + fileData.getString("String_Node_Str");
fileData.put("String_Node_Str",loggedinUser);
fileData.put("String_Node_Str",fileTargetPath);
}
 catch (Exception e) {
return "String_Node_Str";
}
case XHR_COMMAND:
String reqURL=instruction.substring(CODE.length() + 5);
String POSTdata=null;
int pipeIndex=reqURL.indexOf("String_Node_Str");
if (pipeIndex > -1) {
POSTdata=reqURL.substring(pipeIndex + 1);
reqURL=reqURL.substring(0,pipeIndex);
}
if (fileData != null) {
POSTdata+="String_Node_Str" + fileData.toString();
}
if (!DeviceInfo.isSimulator()) {
reqURL+="String_Node_Str";
}
if ((RadioInfo.getActiveWAFs() & RadioInfo.WAF_WLAN) != 0) {
if (CoverageInfo.isCoverageSufficient(CoverageInfo.COVERAGE_DIRECT,RadioInfo.WAF_WLAN,true)) {
reqURL+="String_Node_Str";
}
}
connThread.fetch(reqURL,POSTdata);
reqURL=null;
POSTdata=null;
break;
}
return null;
}

Fixed version (ground truth):
public String execute(String instruction){
  JSONObject fileData=null;
  String reqURL=null;
switch (getCommand(instruction)) {
case REACHABLE_COMMAND:
    int service=RadioInfo.getActiveWAFs();
  int reachability=NOT_REACHABLE;
if ((service & RadioInfo.WAF_3GPP) != 0 || (service & RadioInfo.WAF_CDMA) != 0 || (service & RadioInfo.WAF_IDEN) != 0) {
  reachability=REACHABLE_VIA_CARRIER_DATA_NETWORK;
}
if ((service & RadioInfo.WAF_WLAN) != 0) {
reachability=REACHABLE_VIA_WIFI_NETWORK;
}
return "String_Node_Str" + reachability + "String_Node_Str"+ reachability+ "String_Node_Str";
case XHR_UPLOAD_COMMAND:
reqURL=instruction.substring(CODE.length() + 11);
int tildaIndex=instruction.lastIndexOf('~');
try {
JSONObject fileDetails=new JSONObject(instruction.substring(tildaIndex + 1));
instruction=instruction.substring(0,tildaIndex);
String filePath=fileDetails.getString("String_Node_Str");
String loggedinUser=fileDetails.getString("String_Node_Str");
fileData=readFileData(filePath);
String fileTargetPath=fileDetails.getString("String_Node_Str") + "String_Node_Str" + fileData.getString("String_Node_Str");
fileData.put("String_Node_Str",loggedinUser);
fileData.put("String_Node_Str",fileTargetPath);
}
 catch (Exception e) {
return "String_Node_Str";
}
case XHR_COMMAND:
reqURL=reqURL == null ? instruction.substring(CODE.length() + 5) : reqURL;
String POSTdata=null;
int pipeIndex=reqURL.indexOf("String_Node_Str");
if (pipeIndex > -1) {
POSTdata=reqURL.substring(pipeIndex + 1);
reqURL=reqURL.substring(0,pipeIndex);
}
if (fileData != null) {
POSTdata+="String_Node_Str" + fileData.toString();
}
if (!DeviceInfo.isSimulator()) {
reqURL+="String_Node_Str";
}
if ((RadioInfo.getActiveWAFs() & RadioInfo.WAF_WLAN) != 0) {
if (CoverageInfo.isCoverageSufficient(CoverageInfo.COVERAGE_DIRECT,RadioInfo.WAF_WLAN,true)) {
reqURL+="String_Node_Str";
}
}
connThread.fetch(reqURL,POSTdata);
reqURL=null;
POSTdata=null;
break;
}
return null;
}