linux-kernel - Text mode VGA-console scrolling is broken in upstream & stable trees

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Message-ID: <C4_ogGo3eSdgo3wcbkdIXQDoGk2CShDfiQEjnwmgLUvd1cVp5kKguDC4M7KlWO4Tg9Ny3joveq7vH9K_zpBGvIA8-UkU2ogSE1T9Y6782js=@protonmail.com>
Date: Wed, 30 Jul 2025 14:06:27 +0000
From: Jari Ruusu <jariruusu@...tonmail.com>
To: Yi Yang <yiyang13@...wei.com>, GONG Ruiqi <gongruiqi1@...wei.com>, Helge Deller <deller@....de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Sasha Levin <sashal@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "stable@...r.kernel.org" <stable@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Text mode VGA-console scrolling is broken in upstream & stable trees

The patch that broke text mode VGA-console scrolling is this one:
"vgacon: Add check for vc_origin address range in vgacon_scroll()"
commit 864f9963ec6b4b76d104d595ba28110b87158003 upstream.

How to preproduce:
(1) boot a kernel that is configured to use text mode VGA-console
(2) type commands:  ls -l /usr/bin | less -S
(3) scroll up/down with cursor-down/up keys

Above mentioned patch seems to have landed in upstream and all
kernel.org stable trees with zero testing. Even minimal testing
would have shown that it breaks text mode VGA-console scrolling.

Greg, Sasha, Linus,
Please consider reverting that buggy patch from all affected trees.

--
Jari Ruusu  4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD  ACDF F073 3C80 8132 F189