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Date:   Tue, 30 Apr 2019 23:40:14 -0400 (EDT)
From:   David Miller <>
Subject: Re: [PATCH net] ipv6: fix races in ip6_dst_destroy()

From: Eric Dumazet <>
Date: Sun, 28 Apr 2019 12:22:25 -0700

> 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.
> Fixes: a68886a69180 ("net/ipv6: Make from in rt6_info rcu protected")
> Signed-off-by: Eric Dumazet <>
> Reported-by: syzbot <>
> Cc: David Ahern <>

Applied and queued up for -stable, thanks Eric.

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