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Groups > linux.kernel > #1568814

Re: net: suspicious RCU usage in nf_hook

From Cong Wang <xiyou.wangcong@gmail.com>
Newsgroups linux.kernel
Subject Re: net: suspicious RCU usage in nf_hook
Date 2017-01-28 02:10 +0100
Message-ID <t4pGG-35v-11@gated-at.bofh.it> (permalink)
References <t4mSt-1o8-3@gated-at.bofh.it> <t4orf-2aJ-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri, Jan 27, 2017 at 3:35 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> Oh well, I forgot to submit the official patch I think, Jan 9th.
>
> https://groups.google.com/forum/#!topic/syzkaller/BhyN5OFd7sQ
>

Hmm, but why only fragments need skb_orphan()? It seems like
any kfree_skb() inside a nf hook needs to have a preceding
skb_orphan().

Also, I am not convinced it is similar to commit 8282f27449bf15548
which is on RX path.

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Thread

net: suspicious RCU usage in nf_hook Dmitry Vyukov <dvyukov@google.com> - 2017-01-27 23:10 +0100
  Re: net: suspicious RCU usage in nf_hook Cong Wang <xiyou.wangcong@gmail.com> - 2017-01-28 00:30 +0100
    Re: net: suspicious RCU usage in nf_hook Cong Wang <xiyou.wangcong@gmail.com> - 2017-01-28 00:40 +0100
  Re: net: suspicious RCU usage in nf_hook Eric Dumazet <eric.dumazet@gmail.com> - 2017-01-28 00:50 +0100
    Re: net: suspicious RCU usage in nf_hook Cong Wang <xiyou.wangcong@gmail.com> - 2017-01-28 02:10 +0100
      Re: net: suspicious RCU usage in nf_hook Eric Dumazet <eric.dumazet@gmail.com> - 2017-01-28 02:40 +0100

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