Re: [PATCH net] net: set default network namespace in init_dummy_netdev()

[David Miller]

From: Josh Elsasser <jelsasser@xxxxxxxxxxx>
Date: Sat, 26 Jan 2019 14:38:33 -0800

> Assign a default net namespace to netdevs created by init_dummy_netdev().
> Fixes a NULL pointer dereference caused by busy-polling a socket bound to
> an iwlwifi wireless device, which bumps the per-net BUSYPOLLRXPACKETS stat
> if napi_poll() received packets:
> 
>   BUG: unable to handle kernel NULL pointer dereference at 0000000000000190
>   IP: napi_busy_loop+0xd6/0x200
>   Call Trace:
>     sock_poll+0x5e/0x80
>     do_sys_poll+0x324/0x5a0
>     SyS_poll+0x6c/0xf0
>     do_syscall_64+0x6b/0x1f0
>     entry_SYSCALL_64_after_hwframe+0x3d/0xa2
> 
> Fixes: 7db6b048da3b ("net: Commonize busy polling code to focus on napi_id instead of socket")
> Signed-off-by: Josh Elsasser <jelsasser@xxxxxxxxxxx>

Applied and queued up for -stable.