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[PATCH 10/60] ui/console-vc: fix off-by-one in CSI J 2 (clear entire screen)

Marc-André Lureau posted 60 patches 2 weeks, 6 days ago

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Maintainers: "Marc-André Lureau" <marcandre.lureau@redhat.com>, John Snow <jsnow@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Mauro Carvalho Chehab <mchehab+huawei@kernel.org>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Jan Kiszka <jan.kiszka@web.de>, Phil Dennis-Jordan <phil@philjordan.eu>, Richard Henderson <richard.henderson@linaro.org>, Helge Deller <deller@gmx.de>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Gerd Hoffmann <kraxel@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Samuel Tardieu <sam@rfc1149.net>, Igor Mitsyanko <i.mitsyanko@gmail.com>, "Hervé Poussineau" <hpoussin@reactos.org>, Aleksandar Rikalo <arikalo@gmail.com>, Laurent Vivier <laurent@vivier.eu>, Thomas Huth <th.huth+qemu@posteo.eu>, BALATON Zoltan <balaton@eik.bme.hu>, "Michael S. Tsirkin" <mst@redhat.com>, Stefano Garzarella <sgarzare@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>, Dmitry Osipenko <dmitry.osipenko@collabora.com>, Dmitry Fleytman <dmitry.fleytman@gmail.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Alistair Francis <alistair@alistair23.me>, Alex Williamson <alex@shazbot.org>, "Cédric Le Goater" <clg@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Fabiano Rosas <farosas@suse.de>

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[PATCH 10/60] ui/console-vc: fix off-by-one in CSI J 2 (clear entire screen)

Posted by Marc-André Lureau 2 weeks, 6 days ago

The loop condition used `y <= s->height` instead of `y < s->height`,
causing vc_clear_xy() to be called with y == s->height. This clears
a row in the scrollback buffer beyond the visible screen.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 ui/console-vc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui/console-vc.c b/ui/console-vc.c
index f22806fed79..8dee1f9bd01 100644
--- a/ui/console-vc.c
+++ b/ui/console-vc.c
@@ -899,7 +899,7 @@ static void vc_putchar(VCChardev *vc, int ch)
                     break;
                 case 2:
                     /* clear entire screen */
-                    for (y = 0; y <= s->height; y++) {
+                    for (y = 0; y < s->height; y++) {
                         for (x = 0; x < s->width; x++) {
                             vc_clear_xy(vc, x, y);
                         }

-- 
2.53.0

Re: [PATCH 10/60] ui/console-vc: fix off-by-one in CSI J 2 (clear entire screen)

Posted by Daniel P. Berrangé 1 week, 6 days ago

On Tue, Mar 17, 2026 at 12:50:24PM +0400, Marc-André Lureau wrote:
> The loop condition used `y <= s->height` instead of `y < s->height`,
> causing vc_clear_xy() to be called with y == s->height. This clears
> a row in the scrollback buffer beyond the visible screen.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  ui/console-vc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
-- 
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