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buffer: validate list elements in Buffer.concat

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Without this change, if any of the elements in the list to be concatenated is
not a Buffer instance, the method fails with "buf.copy is not a function".
Make an isBuffer check before using the copy method so that we can throw with
a better message.

Fixes: https://github.com/nodejs/node/issues/4949
PR-URL: https://github.com/nodejs/node/pull/4951
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Roman Klauke <romaaan.git@gmail.com>
This commit is contained in:
Michaël Zasso 2016-01-29 14:00:02 +01:00
parent de3e94b0ef
commit d2dc234def
2 changed files with 16 additions and 4 deletions
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2
lib/buffer.js
View File

@ -241,6 +241,8 @@ Buffer.concat = function(list, length) {
var pos = 0; var pos = 0;
for (let i = 0; i < list.length; i++) { for (let i = 0; i < list.length; i++) {
var buf = list[i]; var buf = list[i];
if (!Buffer.isBuffer(buf))
throw new TypeError('"list" argument must be an Array of Buffers');
buf.copy(buffer, pos); buf.copy(buffer, pos);
pos += buf.length; pos += buf.length;
} }

18
test/parallel/test-buffer-concat.js
View File

@ -20,8 +20,18 @@ assert(flatOne !== one[0]);
assert(flatLong.toString() === (new Array(10 + 1).join('asdf'))); assert(flatLong.toString() === (new Array(10 + 1).join('asdf')));
assert(flatLongLen.toString() === (new Array(10 + 1).join('asdf'))); assert(flatLongLen.toString() === (new Array(10 + 1).join('asdf')));
assert.throws(function() { assertWrongList();
Buffer.concat([42]); assertWrongList(null);
}, TypeError); assertWrongList(new Buffer('hello'));
assertWrongList([42]);
assertWrongList(['hello', 'world']);
assertWrongList(['hello', new Buffer('world')]);
console.log('ok'); function assertWrongList(value) {
assert.throws(function() {
Buffer.concat(value);
}, function(err) {
return err instanceof TypeError &&
err.message === '"list" argument must be an Array of Buffers';
});
}