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Add Y bounds check to InvokePrompt (Fixes #4790) #4791

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Add Y bounds check to InvokePrompt (Fixes #4790) #4791

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10 changes: 9 additions & 1 deletion PSReadLine/ReadLine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1035,16 +1035,24 @@ public static void DigitArgument(ConsoleKeyInfo? key = null, object arg = null)
public static void InvokePrompt(ConsoleKeyInfo? key = null, object arg = null)
{
var console = _singleton._console;
console.CursorVisible = false;

if (arg is int newY)
{
if (newY < 0 || newY >= console.BufferHeight)
throw new ArgumentOutOfRangeException(nameof(arg));

console.CursorVisible = false;
console.SetCursorPosition(0, newY);
}
else
{
newY = _singleton._initialY - _singleton._options.ExtraPromptLineCount;

// Silently return if user has implicitly requested an impossible prompt invocation.
if (newY < 0)
return;

console.CursorVisible = false;
console.SetCursorPosition(0, newY);

// We need to rewrite the prompt, so blank out everything from a previous prompt invocation
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