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buffer: fix value check for writeUInt{B,L}E #3500

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buffer: fix value check for writeUInt{B,L}E #3500

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12 changes: 8 additions & 4 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -832,8 +832,10 @@ Buffer.prototype.writeUIntLE = function(value, offset, byteLength, noAssert) {
value = +value;
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert)
checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0);
if (!noAssert) {
const maxBytes = Math.pow(2, 8 * byteLength) - 1;
checkInt(this, value, offset, byteLength, maxBytes, 0);
}

var mul = 1;
var i = 0;
Expand All @@ -849,8 +851,10 @@ Buffer.prototype.writeUIntBE = function(value, offset, byteLength, noAssert) {
value = +value;
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert)
checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0);
if (!noAssert) {
const maxBytes = Math.pow(2, 8 * byteLength) - 1;
checkInt(this, value, offset, byteLength, maxBytes, 0);
}

var i = byteLength - 1;
var mul = 1;
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19 changes: 19 additions & 0 deletions test/parallel/test-writeuint.js
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Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,25 @@ function test32(clazz) {
}


function testUint(clazz) {
const data = new clazz(8);
var val = 1;

// Test 0 to 5 bytes.
for (var i = 0; i <= 5; i++) {
const errmsg = `byteLength: ${i}`;
ASSERT.throws(function() {
data.writeUIntBE(val, 0, i);
}, /value is out of bounds/, errmsg);
ASSERT.throws(function() {
data.writeUIntLE(val, 0, i);
}, /value is out of bounds/, errmsg);
val *= 0x100;
}
}


test8(Buffer);
test16(Buffer);
test32(Buffer);
testUint(Buffer);