From: Paolo Abeni <pab...@redhat.com>
Date: Fri, 18 May 2018 14:51:44 +0200
> Hangbin reported an Oops triggered by the syzkaller qdisc rules:
...
> When a red qdisc is updated with a 0 limit, the child qdisc is left
> unmodified, no additional scheduler is created in red_change(),
> the 'child' local variable is rightfully NULL and must not add it
> to the hash table.
>
> This change addresses the above issue moving qdisc_hash_add() right
> after the child qdisc creation. It additionally removes unneeded checks
> for noop_qdisc.
>
> Reported-by: Hangbin Liu <liuhang...@gmail.com>
> Fixes: 49b499718fa1 ("net: sched: make default fifo qdiscs appear in the
> dump")
> Signed-off-by: Paolo Abeni <pab...@redhat.com>
Applied and queued up for -stable, thanks Paolo.
