linux-kernel - Re: [PATCH] vt: Fix a missing-check bug in drivers/tty/vt/vt.c file of Linux 5.0.14

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Message-ID: <20190516090726.GA3283@zhanggen-UX430UQ>
Date:   Thu, 16 May 2019 17:07:26 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vt: Fix a missing-check bug in drivers/tty/vt/vt.c file
 of Linux 5.0.14

On Mon, May 13, 2019 at 11:58:09AM +0200, Greg KH wrote:
> qemu should work just fine, I don't know what else to suggest.  Run it
> on "real hardware" with a kmalloc function modified to fail this
> allocation?
> 
> good luck!
> 
> greg k-h
I don't think we need to unwind the loop. The loop condition 
MIN_NR_CONSOLES is defined as 1 in include/uapi/linux/vt.h. In this
situation, should we free other memory except vc_cons[currcons].d, vc
and vc->vc_screenbuf?
Thanks
Gen