Re: [Bugme-new] [Bug 9572] New: Dereferencing NULL pointer on drivers/usb/serial/mos7720.c

On Sat, 15 Dec 2007 06:53:48 -0800 (PST) [email protected] wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=9572
> 
>            Summary: Dereferencing NULL pointer on
>                     drivers/usb/serial/mos7720.c
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: 2.6.23
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: USB
>         AssignedTo: [email protected]
>         ReportedBy: [email protected]
> 
> 
> There is a NULL pointer dereference on drivers/usb/serial/mos7720.c
> The error can be tracked down as follows:
> 
> (1) line 568: there's a test "if (serial->dev)" implying that
>     null is a legal value for "serial->dev" at that point
> 
> (2) line 576: "serial" is passed in as an argument to "send_mos_cmd"
> 
> (3) line 282: "send_mos_cmd" unconditionally dereferences serial->dev
>     at expression "le16_to_cpu(serial->dev->descriptor.idProduct)
> 

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