Language: C
Label: vulnerable
CWE: CWE-835 \u2014 Loop with Unreachable Exit Condition ('Infinite Loop')
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Code:
_pdfioDictSetValue(
    pdfio_dict_t   *dict,		// I - Dictionary
    const char     *key,		// I - Key
    _pdfio_value_t *value)		// I - Value
{
  _pdfio_pair_t	*pair;			// Current pair


  PDFIO_DEBUG("_pdfioDictSetValue(dict=%p, key=\"%s\", value=%p)\n", dict, key, (void *)value);

  // See if the key is already set...
  if (dict->num_pairs > 0)
  {
    _pdfio_pair_t	pkey;		// Search key

    pkey.key = key;

    if ((pair = (_pdfio_pair_t *)bsearch(&pkey, dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs)) != NULL)
    {
      // Yes, replace the value...
      PDFIO_DEBUG("_pdfioDictSetValue: Replacing existing value.\n");
      if (pair->value.type == PDFIO_VALTYPE_BINARY)
        free(pair->value.value.binary.data);
      pair->value = *value;
      return (true);
    }
  }

  // Nope, add a pair...
  if (dict->num_pairs >= dict->alloc_pairs)
  {
    // Expand the dictionary...
    _pdfio_pair_t *temp = (_pdfio_pair_t *)realloc(dict->pairs, (dict->alloc_pairs + 8) * sizeof(_pdfio_pair_t));

    if (!temp)
    {
      PDFIO_DEBUG("_pdfioDictSetValue: Out of memory.\n");
      return (false);
    }

    dict->pairs       = temp;
    dict->alloc_pairs += 8;
  }

  pair = dict->pairs + dict->num_pairs;
  dict->num_pairs ++;

  pair->key   = key;
  pair->value = *value;

  // Re-sort the dictionary and return...
  if (dict->num_pairs > 1 && compare_pairs(pair - 1, pair) > 0)
    qsort(dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs);

#ifdef DEBUG
  PDFIO_DEBUG("_pdfioDictSetValue(%p): %lu pairs\n", (void *)dict, (unsigned long)dict->num_pairs);
  PDFIO_DEBUG("_pdfioDictSetValue(%p): ", (void *)dict);
  PDFIO_DEBUG_DICT(dict);
  PDFIO_DEBUG("\n");
#endif // DEBUG

  return (true);
}