linux-kernel - [PATCH 3.2 118/164] tty/vt: don't set font mappings on vc not supporting this

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Date:	Fri, 12 Dec 2014 06:14:25 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Imre Deak" <imre.deak@...el.com>
Subject: [PATCH 3.2 118/164] tty/vt: don't set font mappings on vc not
 supporting this

3.2.65-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Imre Deak <imre.deak@...el.com>

commit 9e326f78713a4421fe11afc2ddeac07698fac131 upstream.

We can call this function for a dummy console that doesn't support
setting the font mapping, which will result in a null ptr BUG. So check
for this case and return error for consoles w/o font mapping support.

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=59321
Signed-off-by: Imre Deak <imre.deak@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.2: this function doesn't take a lock, so doesn't
 need to unlock on error]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -518,6 +518,8 @@ int con_set_unimap(struct vc_data *vc, u
 
 	/* Save original vc_unipagdir_loc in case we allocate a new one */
 	p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+	if (!p)
+		return -EINVAL;
 	if (p->readonly) return -EIO;
 	
 	if (!ct) return 0;

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