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buffer: add type check in bidirectionalIndexOf #32770

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b7f65ac
buffer: add type check in bidirectionalIndexOf
Flarna Apr 10, 2020
ef52a76
allow ArrayBufferView
Flarna Apr 10, 2020
0a7ff50
use validateBuffer
Flarna Apr 11, 2020
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buffer: add type check in bidirectionalIndexOf 
Add a type check in bidirectionalIndexOf to avoid using something else
as Buffer. This may happen if e.g. lastIndexOf is called with invalid
this.
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@Flarna
Flarna committed Apr 10, 2020
commit b7f65acb71ed0c7ac257de0c3bd5663871a492c7
4 changes: 4 additions & 0 deletions lib/buffer.js
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Expand Up @@ -899,6 +899,10 @@ Buffer.prototype.compare = function compare(target,
// - encoding - an optional encoding, relevant if val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
if (!Buffer.isBuffer(buffer)) {
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throw new ERR_INVALID_ARG_TYPE('buffer', 'Buffer', buffer);
}

if (typeof byteOffset === 'string') {
encoding = byteOffset;
byteOffset = undefined;
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14 changes: 14 additions & 0 deletions test/parallel/test-buffer-indexof.js
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Expand Up @@ -606,3 +606,17 @@ assert.strictEqual(reallyLong.lastIndexOf(pattern), 0);
assert.strictEqual(haystack.indexOf(needle), 2);
assert.strictEqual(haystack.lastIndexOf(needle), haystack.length - 3);
}

// Avoid abort because of invalid usage
// see https://github.com/nodejs/node/issues/32753
{
assert.throws(() => {
const buffer = require('buffer');
new buffer.Buffer.prototype.lastIndexOf(1, 'str');
}, {
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError',
message: 'The "buffer" argument must be an instance of Buffer. ' +
'Received an instance of lastIndexOf'
});
}