Re: [PATCH 12.5/62] firewire: add minor number range check tofw_device_init()

[Stefan Richter]

On Feb 04 Tejun Heo wrote:
> fw_device_init() didn't check whether the allocated minor number isn't
> too large.  Fail if it goes overflows MINORBITS.
> 
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Suggested-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
>  drivers/firewire/core-device.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- a/drivers/firewire/core-device.c
> +++ b/drivers/firewire/core-device.c
> @@ -1020,6 +1020,10 @@ static void fw_device_init(struct work_s
>  	ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
>  	      idr_get_new(&fw_device_idr, device, &minor) :
>  	      -ENOMEM;
> +	if (minor >= 1 << MINORBITS) {
> +		idr_remove(&fw_device_idr, minor);
> +		minor = -ENOSPC;
> +	}
>  	up_write(&fw_device_rwsem);
>  
>  	if (ret < 0)

Thanks; routing together with the other idr patches through mm Acked-by:
Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>

Not totally sure whether to bother -stable with this, as this condition is
rather difficult to provoke.  But since the fix is small and "obvious",
why not.
-- 
Stefan Richter
-=====-===-= --=- --=--
http://arcgraph.de/sr/
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