From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: sbohrer@rgmadvisors.com, netdev@vger.kernel.org
Subject: Re: [PATCH] udp: ipv4: must add synchronization in udp_sk_rx_dst_set()
Date: Wed, 11 Dec 2013 20:22:12 -0500 (EST) [thread overview]
Message-ID: <20131211.202212.1810247707228138095.davem@davemloft.net> (raw)
In-Reply-To: <1386802011.19078.4.camel@edumazet-glaptop2.roam.corp.google.com>
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 11 Dec 2013 14:46:51 -0800
> From: Eric Dumazet <edumazet@google.com>
>
> Unlike TCP, UDP input path does not hold the socket lock.
>
> Before messing with sk->sk_rx_dst, we must use a spinlock, otherwise
> multiple cpus could leak a refcount.
>
> This patch also takes care of renewing a stale dst entry.
> (When the sk->sk_rx_dst would not be used by IP early demux)
>
> Fixes: 421b3885bf6d ("udp: ipv4: Add udp early demux")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
Applied.
Longterm, perhaps a candidate for using xchg() instead of this
spinlock?
next prev parent reply other threads:[~2013-12-12 1:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-11 0:39 BUG: held lock freed! (udp_queue_rcv_skb) Dave Jones
2013-12-11 0:54 ` Eric Dumazet
2013-12-11 2:07 ` [PATCH] udp: ipv4: fix an use after free in __udp4_lib_rcv() Eric Dumazet
2013-12-11 3:59 ` David Miller
2013-12-11 16:10 ` [PATCH] udp: ipv4: fix potential use after free in udp_v4_early_demux() Eric Dumazet
2013-12-11 21:16 ` David Miller
2013-12-11 22:46 ` [PATCH] udp: ipv4: must add synchronization in udp_sk_rx_dst_set() Eric Dumazet
2013-12-12 1:22 ` David Miller [this message]
2013-12-15 18:30 ` Eric Dumazet
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