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tty: validate file descriptor to avoid int32 overflow #37809

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merged 1 commit into from
Mar 23, 2021
Merged

tty: validate file descriptor to avoid int32 overflow #37809

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3 changes: 2 additions & 1 deletion lib/tty.js
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,8 @@ const {
let readline;

function isatty(fd) {
return NumberIsInteger(fd) && fd >= 0 && isTTY(fd);
return NumberIsInteger(fd) && fd >= 0 && fd <= 2147483647 &&
isTTY(fd);
}

function ReadStream(fd, options) {
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1 change: 1 addition & 0 deletions test/pseudo-tty/test-tty-isatty.js
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Expand Up @@ -10,6 +10,7 @@ strictEqual(isatty(2), true, 'stderr reported to not be a tty, but it is');

strictEqual(isatty(-1), false, '-1 reported to be a tty, but it is not');
strictEqual(isatty(55555), false, '55555 reported to be a tty, but it is not');
strictEqual(isatty(2 ** 31), false, '2^31 reported to be a tty, but it is not');
strictEqual(isatty(1.1), false, '1.1 reported to be a tty, but it is not');
strictEqual(isatty('1'), false, '\'1\' reported to be a tty, but it is not');
strictEqual(isatty({}), false, '{} reported to be a tty, but it is not');
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