Fix #948

src/Buffer.ts

@@ -11,6 +11,7 @@ export const CHAR_DATA_ATTR_INDEX = 0;
 export const CHAR_DATA_CHAR_INDEX = 1;
 export const CHAR_DATA_WIDTH_INDEX = 2;
 export const CHAR_DATA_CODE_INDEX = 3;
+export const MAX_BUFFER_SIZE = -1 >>> 0; // 2^32 - 1
 
 /**
  * This class represents a terminal buffer (an internal state of the terminal), where the
@@ -68,7 +69,10 @@ export class Buffer implements IBuffer {
     if (!this._hasScrollback) {
       return rows;
     }
-    return rows + this._terminal.options.scrollback;
+
+    const correctBuferLength = rows + this._terminal.options.scrollback;
+
+    return correctBuferLength > MAX_BUFFER_SIZE ? MAX_BUFFER_SIZE : correctBuferLength;
   }
 
   /**

src/Terminal.ts

@@ -22,7 +22,7 @@
  */
 
 import { BufferSet } from './BufferSet';
-import { Buffer } from './Buffer';
+import { Buffer, MAX_BUFFER_SIZE } from './Buffer';
 import { CompositionHelper } from './CompositionHelper';
 import { EventEmitter } from './EventEmitter';
 import { Viewport } from './Viewport';
@@ -384,6 +384,8 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
         }
         break;
       case 'scrollback':
+        value = value > 0 && value <= MAX_BUFFER_SIZE ? value : MAX_BUFFER_SIZE;
+
         if (value < 0) {
           console.warn(`${key} cannot be less than 0, value: ${value}`);
           return;