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: <20190512062009.GA25153@kroah.com>
Date:   Sun, 12 May 2019 08:20:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Gen Zhang <blackgod016574@...il.com>
Cc:     linux-kernel <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 Sun, May 12, 2019 at 11:27:19AM +0800, Gen Zhang wrote:
> On Sat, May 11, 2019 at 08:07:41AM +0200, Greg KH wrote:
> > Look at the patch above, all of the whitespace is damaged.  There is no
> > way you took the raw email and then were able to apply that to the
> > kernel tree.
> > 
> > You can not cut/paste patches into gmail, please read the kernel
> > Documentation file all about email clients and how to get them to work
> > properly to send patches.
> Hi Greg,
> I switched to mutt and get rid of cut/paste.
> I patched it successffully with commit 1fb3b526df3bd7647e7854915ae6b22299408baf.
> The patch file is:
> ---
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index fdd12f8..b756609 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -3350,10 +3350,14 @@ static int __init con_init(void)
>  
>  	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
>  		vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
> +		if (!vc_cons[currcons].d || !vc)
> +			goto err_vc;
>  		INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
>  		tty_port_init(&vc->port);
>  		visual_init(vc, currcons, 1);
>  		vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
> +		if (!vc->vc_screenbuf)
> +			goto err_vc_screenbuf;
>  		vc_init(vc, vc->vc_rows, vc->vc_cols,
>  			currcons || !vc->vc_sw->con_save_screen);
>  	}
> @@ -3375,6 +3379,14 @@ static int __init con_init(void)
>  	register_console(&vt_console_driver);
>  #endif
>  	return 0;
> +err_vc:
> +	console_unlock();
> +	return -ENOMEM;
> +err_vc_screenbuf:
> +	console_unlock();
> +	kfree(vc);
> +	vc_cons[currcons].d = NULL;
> +	return -ENOMEM;
>  }
>  console_initcall(con_init);
>  
>  ---
> I hope that the format is not broken any more.

Yes, that worked!  Now, can you resend it in a proper format that I can
apply it in?  (with changelog text, signed-off-by, etc.) as described in
Documentation/SubmittingPatches, I will be glad to review it after the
5.2-rc1 release happens.

thanks,

greg k-h