linux-kernel - Re: [PATCH 090/173] USB: serial/kobil_sct, fix potential tty NULL dereference

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Message-ID: <4DB6994B.3060204@suse.cz>
Date:	Tue, 26 Apr 2011 12:07:07 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Willy Tarreau <w@....eu>
CC:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 090/173] USB: serial/kobil_sct, fix potential tty NULL
 dereference

On 04/25/2011 10:04 PM, Willy Tarreau wrote:
> 2.6.27.59-stable review patch.  If anyone has any objections, please let us know.
>
> ------------------
>
> From: Jiri Slaby<jslaby@...e.cz>
>
> commit 6960f40a954619857e7095a6179eef896f297077 upstream.
>
> Make sure that we check the return value of tty_port_tty_get.
> Sometimes it may return NULL and we later dereference that.
>
> The only place here is in kobil_read_int_callback, so fix it.
>
> Signed-off-by: Jiri Slaby<jslaby@...e.cz>
> Cc: Alan Cox<alan@...ux.intel.com>
> Signed-off-by: Greg Kroah-Hartman<gregkh@...e.de>
>
> ---
>   drivers/usb/serial/kobil_sct.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/drivers/usb/serial/kobil_sct.c
> +++ b/drivers/usb/serial/kobil_sct.c
> @@ -372,7 +372,7 @@ static void kobil_read_int_callback(stru
>   	}
>
>   	tty = port->port.tty;
> -	if (urb->actual_length) {
> +	if (tty&&  urb->actual_length) {

Ok, but this doesn't fix the bug (the URB should be killed or something 
similar in that kernel), it only makes the window smaller.

regards,
-- 
js
suse labs
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