CID 1508977: Resource leak

[maskit]

101int
102get_redis_auth_key(char *retKeyBuff, int buffSize)
103{
104  int retval = 0;
105  // Get the Key
   	1. Condition ssl_param.redis_auth_key_file.length(), taking true branch.
106  if (ssl_param.redis_auth_key_file.length()) {
   	2. open_fn: Returning handle opened by open.
   	3. var_assign: Assigning: fd = handle returned from open(ssl_param.redis_auth_key_file.c_str(), 0).
107    int fd = open(ssl_param.redis_auth_key_file.c_str(), O_RDONLY);
108    struct stat info;
     	CID 1508975: Argument cannot be negative (NEGATIVE_RETURNS) [[select issue](https://scan6.scan.coverity.com/defectInstanceId=34625550&fileInstanceId=157339969&mergedDefectId=1508975)]
   	4. noescape: Resource fd is not freed or pointed-to in fstat. [Note: The source code implementation of the function has been overridden by a builtin model.]
   	5. Condition 0 == fstat(fd, &info), taking true branch.
109    if (0 == fstat(fd, &info)) {
110      size_t n = info.st_size;
111      std::string key_data;
112      key_data.resize(n);
   	6. noescape: Resource fd is not freed or pointed-to in read.
113      auto read_len = read(fd, const_cast<char *>(key_data.data()), n);
114      // Strip any trailing newlines
   	7. Condition read_len > 1, taking true branch.
   	8. Condition key_data[read_len - 1] == '\n', taking true branch.
   	10. Condition read_len > 1, taking true branch.
   	11. Condition key_data[read_len - 1] == '\n', taking true branch.
   	13. Condition read_len > 1, taking true branch.
   	14. Condition key_data[read_len - 1] == '\n', taking false branch.
115      while (read_len > 1 && key_data[read_len - 1] == '\n') {
116        --read_len;
   	9. Jumping back to the beginning of the loop.
   	12. Jumping back to the beginning of the loop.
117      }
118      memset(retKeyBuff, 0, buffSize);
     	CID 1508982: Argument cannot be negative (NEGATIVE_RETURNS) [[select issue](https://scan6.scan.coverity.com/defectInstanceId=34625480&fileInstanceId=157339969&mergedDefectId=1508982)]
     	CID 1508997: Out-of-bounds access (OVERRUN) [[select issue](https://scan6.scan.coverity.com/defectInstanceId=34625595&fileInstanceId=157339969&mergedDefectId=1508997)]
119      strncpy(retKeyBuff, key_data.c_str(), read_len);
120      retval = key_data.length();
121    }
   	
CID 1508977 (#1-2 of 2): Resource leak (RESOURCE_LEAK)
15. leaked_handle: Handle variable fd going out of scope leaks the handle.
122  } else {
123    TSError("Can not get redis auth key.");
124  }
125
126  return retval;
127}