text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_42.c
  Label Definition File: CWE122_Heap_Based_Buffer_Overflow__c_CWE129.label.xml
  Template File: sources-sinks-42.tmpl.c
  */
  /*
   * @description
   * CWE: 122 Heap Based Buffer Overflow
   * BadSource: fscanf Read data from the console using fscanf()
   * GoodSource: Larger than zero but less than 10
   * Sinks:
   *    GoodSink: Ensure the array index is valid
   *    BadSink : Improperly check the array index by not checking the upper bound
   * Flow Variant: 42 Data flow: data returned from one function to another in the same source file
   *
   * */
  
  #include "std_testcase.h"
  
  #ifndef OMITBAD
  
  static int badSource(int data)
  {
      /* POTENTIAL FLAW: Read data from the console using fscanf() */
      fscanf(stdin, "%d", &data);
      return data;
  }
  
  void CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_42_bad()
  {
      int data;
      /* Initialize data */
      data = -1;
      data = badSource(data);
      {
          int i;
          int * buffer = (int *)malloc(10 * sizeof(int));
          /* initialize buffer */
          for (i = 0; i < 10; i++)
          {
              buffer[i] = 0;
          }
          /* POTENTIAL FLAW: Attempt to write to an index of the array that is above the upper bound
           * This code does check to see if the array index is negative */
          if (data >= 0)
          {
              buffer[data] = 1;
              /* Print the array values */
              for(i = 0; i < 10; i++)
              {
                  printIntLine(buffer[i]);
              }
          }
          else
          {
              printLine("ERROR: Array index is negative.");
          }
          free(buffer);
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodG2B uses the GoodSource with the BadSink */
  static int goodG2BSource(int data)
  {
      /* FIX: Use a value greater than 0, but less than 10 to avoid attempting to
      * access an index of the array in the sink that is out-of-bounds */
      data = 7;
      return data;
  }
  
  static void goodG2B()
  {
      int data;
      /* Initialize data */
      data = -1;
      data = goodG2BSource(data);
      {
          int i;
          int * buffer = (int *)malloc(10 * sizeof(int));
          /* initialize buffer */
          for (i = 0; i < 10; i++)
          {
              buffer[i] = 0;
          }
          /* POTENTIAL FLAW: Attempt to write to an index of the array that is above the upper bound
           * This code does check to see if the array index is negative */
          if (data >= 0)
          {
              buffer[data] = 1;
              /* Print the array values */
              for(i = 0; i < 10; i++)
              {
                  printIntLine(buffer[i]);
              }
          }
          else
          {
              printLine("ERROR: Array index is negative.");
          }
          free(buffer);
      }
  }
  
  /* goodB2G uses the BadSource with the GoodSink */
  static int goodB2GSource(int data)
  {
      /* POTENTIAL FLAW: Read data from the console using fscanf() */
      fscanf(stdin, "%d", &data);
      return data;
  }
  
  static void goodB2G()
  {
      int data;
      /* Initialize data */
      data = -1;
      data = goodB2GSource(data);
      {
          int i;
          int * buffer = (int *)malloc(10 * sizeof(int));
          /* initialize buffer */
          for (i = 0; i < 10; i++)
          {
              buffer[i] = 0;
          }
          /* FIX: Properly validate the array index and prevent a buffer overflow */
          if (data >= 0 && data < (10))
          {
              buffer[data] = 1;
              /* Print the array values */
              for(i = 0; i < 10; i++)
              {
                  printIntLine(buffer[i]);
              }
          }
          else
          {
              printLine("ERROR: Array index is out-of-bounds");
          }
          free(buffer);
      }
  }
  
  void CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_42_good()
  {
      goodB2G();
      goodG2B();
  }
  
  #endif /* OMITGOOD */
  
  /* Below is the main(). It is only used when building this testcase on
     its own for testing or for building a binary to use in testing binary
     analysis tools. It is not used when compiling all the testcases as one
     application, which is how source code analysis tools are tested. */
  
  #ifdef INCLUDEMAIN
  
  int main(int argc, char * argv[])
  {
      /* seed randomness */
      srand( (unsigned)time(NULL) );
  #ifndef OMITGOOD
      printLine("Calling good()...");
      CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_42_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_42_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  