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fix: Fixing a potential race condition and possibly memory leak in "powerShellStart" #696

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fix: Fixing a potential race condition and possibly memory leak in "powerShellStart" #696

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48 changes: 29 additions & 19 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -396,32 +396,42 @@ function powerShellProceedResults(data) {
}

function powerShellStart() {
// Reuse existing persisted process, if one is available
if (_psPersistent && _psChild && _psChild.pid){
return;
}

// If somehow _psPersistent is not in sync with _psChild,
// just kill it and start a new one.
if (!_psPersistent && _psChild && _psChild.pid) {
powerShellRelease();
}

_psChild = spawn('powershell.exe', ['-NoLogo', '-InputFormat', 'Text', '-NoExit', '-Command', '-'], {
stdio: 'pipe',
windowsHide: true,
maxBuffer: 1024 * 20000,
encoding: 'UTF-8',
env: util._extend({}, process.env, { LANG: 'en_US.UTF-8' })
});
if (_psChild && _psChild.pid) {
_psPersistent = true;
_psChild.stdout.on('data', function (data) {
_psResult = _psResult + data.toString('utf8');
if (data.indexOf(_psCmdSeperator) >= 0) {
powerShellProceedResults(_psResult);
_psResult = '';
}
});
_psChild.stderr.on('data', function () {
powerShellProceedResults(_psResult + _psError);
});
_psChild.on('error', function () {
powerShellProceedResults(_psResult + _psError);
});
_psChild.on('close', function () {
_psChild.kill();
});
}

_psPersistent = true;
_psChild.stdout.on('data', function (data) {
_psResult = _psResult + data.toString('utf8');
if (data.indexOf(_psCmdSeperator) >= 0) {
powerShellProceedResults(_psResult);
_psResult = '';
}
});
_psChild.stderr.on('data', function () {
powerShellProceedResults(_psResult + _psError);
});
_psChild.on('error', function () {
powerShellProceedResults(_psResult + _psError);
});
_psChild.on('close', function () {
_psChild.kill();
});
}

function powerShellRelease() {
Expand Down