linux-kernel - [PATCH 4.4 17/33] console/dummy: leave .con_font

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Message-Id: <20180221124410.520707607@linuxfoundation.org>
Date:   Wed, 21 Feb 2018 13:45:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicolas Pitre <nico@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH 4.4 17/33] console/dummy: leave .con_font_get set to NULL

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicolas Pitre <nicolas.pitre@...aro.org>

commit 724ba8b30b044aa0d94b1cd374fc15806cdd6f18 upstream.

When this method is set, the caller expects struct console_font fields
to be properly initialized when it returns. Leave it unset otherwise
nonsensical (leaked kernel stack) values are returned to user space.

Signed-off-by: Nicolas Pitre <nico@...aro.org>
Cc: stable@...r.kernel.org
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/video/console/dummycon.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -68,7 +68,6 @@ const struct consw dummy_con = {
     .con_switch =	DUMMY,
     .con_blank =	DUMMY,
     .con_font_set =	DUMMY,
-    .con_font_get =	DUMMY,
     .con_font_default =	DUMMY,
     .con_font_copy =	DUMMY,
     .con_set_palette =	DUMMY,