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Description of problem:
When using an external send program (-e), nanny fails to deallocate the result buffer and leaks memory upon every external invocation.



Version-Release number of selected component (if applicable):
piranha-0.7.0 through piranha-0.8.1

How reproducible:
Always

Steps to Reproduce:
1. start a nanny instance with a verbose external check program executed often (1s):

nanny -c -h 192.168.0.0 -p 1234 -e /sbin/lspci -x BLAH -q -t 1 --lvs&

2. watch the process memory footprint

watch -n1 "cat /proc/$(PID)/status"
  

Actual Results:  The memory footprint continues to grow indefinitely.

Expected Results:  The memory footprint should stabilize.

Additional info:

The actual leak is in nanny.c::external_check() which fails to deallocate the "result" buffer allocated by getExecOutput() using strdup:

        result = getExecOutput (flags, argv, timeout);

        if (expect_str != NULL) {
                if (strcmp (expect_str, result) != 0) {
                        piranha_log (flags, (char *)
                                     "Trouble. Recieved results are not what we 
expected from (%s)\n",
                                     inet_ntoa (*remoteAddr));
                        return 1;
                } else {
                        return 0;
                }

        }

A patch will be available shortly.