linux-kernel - Re: BUG null dereference in driver ./drivers/usb/serial/mos7840.c

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Message-ID: <20091221162002.GA7091@suse.de>
Date:	Mon, 21 Dec 2009 08:20:02 -0800
From:	Greg KH <gregkh@...e.de>
To:	Alexander Strakh <strakh@...ras.ru>
Cc:	Greg Kroah-Hartman <greg@...ah.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: BUG null dereference in driver ./drivers/usb/serial/mos7840.c

On Mon, Dec 21, 2009 at 07:51:09PM +0000, Alexander Strakh wrote:
>         KERNEL_VERSION: 2.6.32
>         SUBJECT: null derefernce in function mos7840_bulk_in_callback
>         SUBSCRIBE:
>         In driver drivers/usb/serial/mos7840.c in function 
> mos7840_bulk_in_callback:
> 
> 1. If in line 697 mos7840_port = NULL then we goto line 699

How can that happen?

> 2. In line 699 we have null dereference.
> 
>  696         mos7840_port = urb->context;
>  697         if (!mos7840_port) {
>  698                 dbg("%s", "NULL mos7840_port pointer");
>  699                 mos7840_port->read_urb_busy = false;
>  700                 return;
>  701         }
> 
> Found by Linux Device Drivers Verification Project (Svace Detector)

What is this?

Are you also going to send patches for stuff like this?

thanks,

greg k-h
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