Re: [PATCH 03/11] net: devres: relax devm_register_netdev()

[Jakub Kicinski]

On Mon, 22 Jun 2020 12:00:48 +0200 Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> 
> This devres helper registers a release callback that only unregisters
> the net_device. It works perfectly fine with netdev structs that are
> not managed on their own. There's no reason to check this - drop the
> warning.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

I think the reasoning for this suggestion was to catch possible UAF
errors. The netdev doesn't necessarily has to be from devm_alloc_* 
but it has to be part of devm-ed memory or memory which is freed 
after driver's remove callback.

Are there cases in practice where you've seen the netdev not being
devm allocated?