[PATCH v2] kobject: fix uevent socket use-after-free on net namespace delete

[Adarsh Das]

Hi Greg,

v2 adds Assisted-by and Tested-by tags as requested.

Local testing: syzbot C repro on unfixed master with -smp 4 (parallel
runs) reproduced the KASAN UAF. With patch applied, no KASAN.

Syzbot testing: #syz test with patch on upstream — Result OK
https://syzkaller.appspot.com/bug?extid=4393dfdddf166f2de2b0

Adarsh