linux-kernel - [PATCH] fbcon: Initialize ops->info early

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Message-Id: <20171113094546.16593-1-thierry.reding@gmail.com>
Date:   Mon, 13 Nov 2017 10:45:46 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: [PATCH] fbcon: Initialize ops->info early

From: Thierry Reding <treding@...dia.com>

During console takeover, which happens for all DRM/KMS setups using the
fbdev helpers, fbcon_startup() is called before fbcon_init() and as a
result con2fb_acquire_newinfo() will not be called (info->fbcon_par was
set to non-NULL in fbcon_startup()) to assign ops->info.

This causes the cursor_timer_handler() to unreference a NULL pointer.

Avoid this by unconditionally assigning ops->info during fbcon_startup()
so that it will be available early, but keep the additional assignment
in con2fb_acquire_newinfo() to support console remapping at runtime.

Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/video/fbdev/core/fbcon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 3b4a96379128..929ca472c524 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -962,6 +962,7 @@ static const char *fbcon_startup(void)
 	ops->graphics = 1;
 	ops->cur_rotate = -1;
 	ops->cur_blink_jiffies = HZ / 5;
+	ops->info = info;
 	info->fbcon_par = ops;
 	if (initial_rotation != -1)
 		p->con_rotate = initial_rotation;
-- 
2.14.1