[Bridge] [PATCH net 2/2] net: bridge: fix lockdep multicast_lock false positive splat

[Herbert Xu]

On Sun, Apr 25, 2021 at 07:45:27PM +0300, Nikolay Aleksandrov wrote:
>
> Ugh.. that's just very ugly. :) The setup you've described above is by all means invalid, but
> possible unfortunately. The bridge already checks if it's being added as a port to another
> bridge, but not through multiple levels of indirection. These locks are completely unrelated
> as they're in very different contexts (different devices).

Surely we should forbid this? Otherwise what's to stop someone
from creating a loop?

Cheers,
-- 
Email: Herbert Xu <herbert at gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt