text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_03.c
  Label Definition File: CWE122_Heap_Based_Buffer_Overflow__c_CWE129.label.xml
  Template File: sources-sinks-03.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: 03 Control flow: if(5==5) and if(5!=5)
   *
   * */
  
  #include "std_testcase.h"
  
  #ifndef OMITBAD
  
  void CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_03_bad()
  {
      int data;
      /* Initialize data */
      data = -1;
      if(5==5)
      {
          /* POTENTIAL FLAW: Read data from the console using fscanf() */
          fscanf(stdin, "%d", &data);
      }
      if(5==5)
      {
          {
              int i;
              int * buffer = (int *)malloc(10 * sizeof(int));
              if (buffer == NULL) {exit(-1);}
              /* 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
  
  /* goodB2G1() - use badsource and goodsink by changing the second 5==5 to 5!=5 */
  static void goodB2G1()
  {
      int data;
      /* Initialize data */
      data = -1;
      if(5==5)
      {
          /* POTENTIAL FLAW: Read data from the console using fscanf() */
          fscanf(stdin, "%d", &data);
      }
      if(5!=5)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
      }
      else
      {
          {
              int i;
              int * buffer = (int *)malloc(10 * sizeof(int));
              if (buffer == NULL) {exit(-1);}
              /* 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);
          }
      }
  }
  
  /* goodB2G2() - use badsource and goodsink by reversing the blocks in the second if */
  static void goodB2G2()
  {
      int data;
      /* Initialize data */
      data = -1;
      if(5==5)
      {
          /* POTENTIAL FLAW: Read data from the console using fscanf() */
          fscanf(stdin, "%d", &data);
      }
      if(5==5)
      {
          {
              int i;
              int * buffer = (int *)malloc(10 * sizeof(int));
              if (buffer == NULL) {exit(-1);}
              /* 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);
          }
      }
  }
  
  /* goodG2B1() - use goodsource and badsink by changing the first 5==5 to 5!=5 */
  static void goodG2B1()
  {
      int data;
      /* Initialize data */
      data = -1;
      if(5!=5)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
      }
      else
      {
          /* 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;
      }
      if(5==5)
      {
          {
              int i;
              int * buffer = (int *)malloc(10 * sizeof(int));
              if (buffer == NULL) {exit(-1);}
              /* 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);
          }
      }
  }
  
  /* goodG2B2() - use goodsource and badsink by reversing the blocks in the first if */
  static void goodG2B2()
  {
      int data;
      /* Initialize data */
      data = -1;
      if(5==5)
      {
          /* 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;
      }
      if(5==5)
      {
          {
              int i;
              int * buffer = (int *)malloc(10 * sizeof(int));
              if (buffer == NULL) {exit(-1);}
              /* 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);
          }
      }
  }
  
  void CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_03_good()
  {
      goodB2G1();
      goodB2G2();
      goodG2B1();
      goodG2B2();
  }
  
  #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_03_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE122_Heap_Based_Buffer_Overflow__c_CWE129_fscanf_03_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  