Re: [PATCH net] net_sched: fix NULL deref in fifo_set_limit()

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Thu, 30 Sep 2021 14:22:39 -0700 you wrote:

From: Eric Dumazet <edumazet@google.com>

syzbot reported another NULL deref in fifo_set_limit() [1]

I could repro the issue with :

unshare -n
tc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit
tc qd replace dev lo parent 1:0 pfifo_fast
tc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit

[...]

Here is the summary with links:
  - [net] net_sched: fix NULL deref in fifo_set_limit()
    https://git.kernel.org/netdev/net/c/560ee196fe9e

You are awesome, thank you!
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