linux-kernel - Re: [patch] vt: NULL dereference in vt_do_kdsk

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Message-ID: <20120310124522.64fc5851@pyramind.ukuu.org.uk>
Date:	Sat, 10 Mar 2012 12:45:22 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...ux.intel.com>,
	Jovi Zhang <bookjovi@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] vt: NULL dereference in vt_do_kdsk_ioctl()

On Sat, 10 Mar 2012 11:59:23 +0300
Dan Carpenter <dan.carpenter@...cle.com> wrote:

> We forgot to set the "key_map" variable here, so it's still NULL.  This
> was introduced recently in 079c9534a9 "vt:tackle kbd_table".
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
> index 70d0593..86dd1e3 100644
> --- a/drivers/tty/vt/keyboard.c
> +++ b/drivers/tty/vt/keyboard.c
> @@ -1863,6 +1863,7 @@ int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm,
>  				return -EPERM;
>  			}
>  			key_maps[s] = new_map;
> +			key_map = new_map;
>  			key_map[0] = U(K_ALLOCATED);
>  			for (j = 1; j < NR_KEYS; j++)
>  				key_map[j] = U(K_HOLE);

Eep I thought I got all of those. Well noted

Acked-by: Alan Cox <alan@...ux.intel.com>
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