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[BLUE] IOCTL_CONSOLE_DRAW: Fix ConsoleDraw.SizeX/Y boundary checks. Always set the cursor position before possibly refreshing screen.

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This commit is contained in:
Hermès Bélusca-Maïto
2020-12-27 00:51:42 +01:00
parent f6de3342bf
commit 4ab49bc276
1 changed files with 10 additions and 9 deletions
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drivers/setup/blue/blue.c
+10 -9
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@@ -1455,6 +1455,14 @@ ScrIoControl(
break;
}
Irp->IoStatus.Information = 0;
/* Set the cursor position, clipping it to the screen */
DeviceExtension->CursorX = min(max(ConsoleDraw.CursorX, 0), DeviceExtension->Columns - 1);
DeviceExtension->CursorY = min(max(ConsoleDraw.CursorY, 0), DeviceExtension->Rows - 1);
if (DeviceExtension->Enabled)
ScrSetCursor(DeviceExtension);
// TODO: For the moment if the ConsoleDraw rectangle has borders
// out of the screen-buffer we just bail out. Would it be better
// to actually clip the rectangle within its borders instead?
@@ -1464,8 +1472,8 @@ ScrIoControl(
Status = STATUS_SUCCESS;
break;
}
if ( ConsoleDraw.SizeX >= DeviceExtension->Columns - ConsoleDraw.X ||
ConsoleDraw.SizeY >= DeviceExtension->Rows - ConsoleDraw.Y )
if ( ConsoleDraw.SizeX > DeviceExtension->Columns - ConsoleDraw.X ||
ConsoleDraw.SizeY > DeviceExtension->Rows - ConsoleDraw.Y )
{
Status = STATUS_SUCCESS;
break;
@@ -1489,13 +1497,6 @@ ScrIoControl(
}
}
/* Set the cursor position, clipping it to the screen */
DeviceExtension->CursorX = min(max(ConsoleDraw.CursorX, 0), DeviceExtension->Columns - 1);
DeviceExtension->CursorY = min(max(ConsoleDraw.CursorY, 0), DeviceExtension->Rows - 1);
if (DeviceExtension->Enabled)
ScrSetCursor(DeviceExtension);
Irp->IoStatus.Information = 0;
Status = STATUS_SUCCESS;
break;
}