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child_process: Check stderr before accessing it #9152

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child_process: Check stderr before accessing it #9152

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4 changes: 2 additions & 2 deletions lib/child_process.js
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Original file line number Diff line number Diff line change
Expand Up @@ -479,7 +479,7 @@ function execFileSync(/*command, args, options*/) {

var ret = spawnSync(opts.file, opts.args.slice(1), opts.options);

if (inheritStderr)
if (inheritStderr && ret.stderr)
process.stderr.write(ret.stderr);

var err = checkExecSyncError(ret);
Expand All @@ -499,7 +499,7 @@ function execSync(/*command, options*/) {
var ret = spawnSync(opts.file, opts.args, opts.options);
ret.cmd = opts.cmd;

if (inheritStderr)
if (inheritStderr && ret.stderr)
process.stderr.write(ret.stderr);

var err = checkExecSyncError(ret);
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12 changes: 12 additions & 0 deletions test/sequential/test-child-process-execsync.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,18 @@ var start = Date.now();
var err;
var caught = false;

// Verify that stderr is not accessed when a bad shell is used
assert.throws(
function() { execSync('exit -1', {shell: 'bad_shell'}); },
/ENOENT/,
'execSync did not throw the expected exception!'
);
assert.throws(
function() { execFileSync('exit -1', {shell: 'bad_shell'}); },
/ENOENT/,
'execFileSync did not throw the expected exception!'
);

try {
var cmd = `"${process.execPath}" -e "setTimeout(function(){}, ${SLEEP});"`;
var ret = execSync(cmd, {timeout: TIMER});
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