Re: [PATCH v4] irqchip/gicv3-its: Don't allow devices whose ID is outside range

From: Marc Zyngier
Date: Thu Mar 17 2016 - 11:34:38 EST

On 17/03/16 15:18, Shanker Donthineni wrote:
> We are not checking whether the requested device identifier fits into
> the device table memory or not. The function its_create_device()
> assumes that enough memory has been allocated for whole DevID space
> (reported by ITS_TYPER.Devbits) during the ITS probe() and continues
> to initialize ITS hardware.
> This assumption is not perfect, sometimes we reduce memory size either
> because of its size crossing MAX_ORDER-1 or BASERn max size limit. The
> MAPD command fails if 'Device ID' is outside of device table range.
> Add a simple validation check to avoid MAPD failures since we are
> not handling ITS command errors. This change also helps to return an
> error -ENOMEM instead of success to caller.
> Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>

Is there any difference between this patch and the one you posted on
March 10th?


Jazz is not dead. It just smells funny...