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Date:   Mon, 29 Apr 2019 15:52:29 +0000
From:   Martin Lau <>
To:     Eric Dumazet <>
CC:     "David S . Miller" <>,
        netdev <>,
        Eric Dumazet <>,
        syzbot <>,
        David Ahern <>
Subject: Re: [PATCH net] ipv6: fix races in ip6_dst_destroy()

On Sun, Apr 28, 2019 at 12:22:25PM -0700, Eric Dumazet wrote:
> We had many syzbot reports that seem to be caused by use-after-free
> of struct fib6_info.
> ip6_dst_destroy(), fib6_drop_pcpu_from() and rt6_remove_exception()
> are writers vs rt->from, and use non consistent synchronization among
> themselves.
> Switching to xchg() will solve the issues with no possible
> lockdep issues.
Acked-by: Martin KaFai Lau <>

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