tty: validate file descriptor to avoid int32 overflow

Fixes: #37805 PR-URL: #37809 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Darshan Sen <[email protected]>
nodejs · May 1, 2021 · d89d55a · d89d55a
1 parent f533488
commit d89d55a
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diff --git a/lib/tty.js b/lib/tty.js
@@ -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) {

diff --git a/test/pseudo-tty/test-tty-isatty.js b/test/pseudo-tty/test-tty-isatty.js
@@ -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');