Re: [PATCH 2.6.30.4] Fix for NULL pointer dereference by SRP initiator triggered by a SCSI reset after the SRP connection has been closed

[Bart Van Assche <bart.vanassche@gmail.com>]

On Wed, Aug 5, 2009 at 7:44 PM, Roland Dreier<rdreier@cisco.com> wrote:
>
>  > The NULL pointer dereference happens when srp_reset_device() calls
>  > srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET) with
>  > req->scmnd->device == NULL. When the sg_reset command issues an
>  > SG_SCSI_RESET ioctl, scsi_reset_provider() is invoked and allocates an
>  > scmnd structure and sets scmnd->device to NULL. It is this scmnd
>  > structure that is passed to srp_reset_device(). What I'm not sure
>  > about is whether scsi_reset_provider() should set req->scmnd->device
>  > to a non-NULL value or whether srp_send_tsk_mgmt() should be able to
>  > handle the condition req->scmnd->device == NULL.
>
> Well, I don't see how the reset ioctl can do anything useful unless it
> passes a device in with the scsi command -- otherwise for example
> srp_reset_device() has no idea what LUN to try and reset.

(added linux-scsi in CC)

I hope one of the SCSI people can tell us whether the behavior that
scsi_reset_provider()
passes the value NULL in req->scmnd->device to
scsi_try_bus_device_reset() is correct ?

Bart.
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