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fix: prevent process crash when fileFilter calls its callback more than once (fixes #950) #1427

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fix: prevent process crash when fileFilter calls its callback more than once (fixes #950) #1427

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1 change: 1 addition & 0 deletions lib/file-appender.js
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ FileAppender.prototype.removePlaceholder = function (placeholder) {
case 'VALUE': break
case 'ARRAY': arrayRemove(this.req.files, placeholder); break
case 'OBJECT':
if (!this.req.files[placeholder.fieldname]) break
if (this.req.files[placeholder.fieldname].length === 1) {
delete this.req.files[placeholder.fieldname]
} else {
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23 changes: 23 additions & 0 deletions test/file-filter.js
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Original file line number Diff line number Diff line change
Expand Up @@ -53,4 +53,27 @@ describe('File Filter', function () {
done()
})
})

it('should not crash when fileFilter invokes the callback more than once', function (done) {
function rejectThenError (req, file, cb) {
setImmediate(function () {
cb(null, false)
cb(new Error('Fake error'))
})
}

var form = new FormData()
var upload = withFilter(rejectThenError)
var parser = upload.fields([
{ name: 'logo', maxCount: 1 },
{ name: 'banner', maxCount: 1 }
])

form.append('logo', util.file('tiny0.dat'))

util.submitForm(parser, form, function (err, req) {
assert.ok(err)
done()
})
})
})