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

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Date:	Mon, 21 Dec 2009 19:51:09 +0000
From:	Alexander Strakh <strakh@...ras.ru>
To:	"Greg Kroah-Hartman" <greg@...ah.com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: BUG null dereference in driver ./drivers/usb/serial/mos7840.c

        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
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)
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