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[backport v4.x] querystring: don't stringify bad surrogate pair #6125

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[backport v4.x] querystring: don't stringify bad surrogate pair #6125

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7 changes: 6 additions & 1 deletion lib/querystring.js
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Original file line number Diff line number Diff line change
Expand Up @@ -138,7 +138,12 @@ QueryString.escape = function(str) {
}
// Surrogate pair
++i;
c = 0x10000 + (((c & 0x3FF) << 10) | (str.charCodeAt(i) & 0x3FF));
var c2;
if (i < str.length)
c2 = str.charCodeAt(i) & 0x3FF;
else
throw new URIError('URI malformed');
c = 0x10000 + (((c & 0x3FF) << 10) | c2);
out += hexTable[0xF0 | (c >> 18)] +
hexTable[0x80 | ((c >> 12) & 0x3F)] +
hexTable[0x80 | ((c >> 6) & 0x3F)] +
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5 changes: 5 additions & 0 deletions test/parallel/test-querystring.js
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Expand Up @@ -139,6 +139,11 @@ qsWeirdObjects.forEach(function(testCase) {
assert.equal(testCase[1], qs.stringify(testCase[0]));
});

// invalid surrogate pair throws URIError
assert.throws(function() {
qs.stringify({ foo: '\udc00' });
}, URIError);

// coerce numbers to string
assert.strictEqual('foo=0', qs.stringify({ foo: 0 }));
assert.strictEqual('foo=0', qs.stringify({ foo: -0 }));
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