linux-kernel - [PATCH] vt: clear selection before resizing

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Message-ID: <alpine.DEB.2.20.1610131209180.5961@pc>
Date:   Thu, 13 Oct 2016 12:12:43 -0500 (CDT)
From:   Scot Doyle <lkml14@...tdoyle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Jiri Slaby <jslaby@...e.com>, Dmitry Vyukov <dvyukov@...gle.com>,
        Peter Hurley <peter@...leysoftware.com>, tomi.valkeinen@...com,
        jean-philippe.brucker@....com,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: [PATCH] vt: clear selection before resizing

When resizing a vt its selection may exceed the new size, resulting in
an invalid memory access [1]. Clear the selection before resizing.

[1] http://lkml.kernel.org/r/CACT4Y+acDTwy4umEvf5ROBGiRJNrxHN4Cn5szCXE5Jw-d1B=Xw@mail.gmail.com

Reported-and-tested-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Scot Doyle <lkml14@...tdoyle.com>
---
 drivers/tty/vt/vt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 06fb39c..5d6a549 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -874,6 +874,9 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 	if (!newscreen)
 		return -ENOMEM;
 
+	if (vc == sel_cons)
+		clear_selection();
+
 	old_rows = vc->vc_rows;
 	old_row_size = vc->vc_size_row;
 
-- 
2.7.4