Patch "tty/vt: don't set font mappings on vc not supporting this" has been added to the 3.14-stable tree

Patch "tty/vt: don't set font mappings on vc not supporting this" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    tty/vt: don't set font mappings on vc not supporting this

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tty-vt-don-t-set-font-mappings-on-vc-not-supporting-this.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9e326f78713a4421fe11afc2ddeac07698fac131 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Thu, 2 Oct 2014 16:34:31 +0300
Subject: tty/vt: don't set font mappings on vc not supporting this

From: Imre Deak <imre.deak@intel.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@intel.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/tty/vt/consolemap.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -540,6 +540,12 @@ 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) {
+		err = -EINVAL;
+
+		goto out_unlock;
+	}
 	if (p->readonly) {
 		console_unlock();
 		return -EIO;
@@ -633,6 +639,7 @@ int con_set_unimap(struct vc_data *vc, u
 		set_inverse_transl(vc, p, i); /* Update inverse translations */
 	set_inverse_trans_unicode(vc, p);
 
+out_unlock:
 	console_unlock();
 	return err;
 }


Patches currently in stable-queue which might be from imre.deak@intel.com are

queue-3.14/tty-vt-don-t-set-font-mappings-on-vc-not-supporting-this.patch