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Date:	Wed, 02 Dec 2015 23:42:16 -0500 (EST)
From:	David Miller <>
Subject: Re: [PATCH net] ipv6: kill sk_dst_lock

From: Eric Dumazet <>
Date: Mon, 30 Nov 2015 08:35:15 -0800

> From: Eric Dumazet <>
> While testing the np->opt RCU conversion, I found that UDP/IPv6 was
> using a mixture of xchg() and sk_dst_lock to protect concurrent changes
> to sk->sk_dst_cache, leading to possible corruptions and crashes.
> ip6_sk_dst_lookup_flow() uses sk_dst_check() anyway, so the simplest
> way to fix the mess is to remove sk_dst_lock completely, as we did for
> IPv4.
> __ip6_dst_store() and ip6_dst_store() share same implementation.
> sk_setup_caps() being called with socket lock being held or not,
> we have to use sk_dst_set() instead of __sk_dst_set()
> Signed-off-by: Eric Dumazet <>
> Reported-by: Dmitry Vyukov <>

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