SerialUtils.cc: dynamic allocation of arrays based on runtime variable is not 
portable
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                 Key: HADOOP-6263
                 URL: https://issues.apache.org/jira/browse/HADOOP-6263
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Allen Wittenauer


In SerialUtils.cc, the following code appears:

    int len;
    if (b < -120) {
      negative = true;
      len = -120 - b;
    } else {
      negative = false;
      len = -112 - b;
    }
    uint8_t barr[len];


as far as I'm aware, this is not legal in ANSI C and will be rejected by ANSI 
compliant compilers.  Instead, this should be malloc()'d based upon the size of 
len and free()'d later.

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