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Date:   Thu, 9 Apr 2020 01:14:01 +0200
From:   Daniel Borkmann <>
To:     Joe Stringer <>,
Subject: Re: [PATCH bpf] bpf: Fix use of sk->sk_reuseport from sk_assign

On 4/8/20 5:35 AM, Joe Stringer wrote:
> In testing, we found that for request sockets the sk->sk_reuseport field
> may yet be uninitialized, which caused bpf_sk_assign() to randomly
> succeed or return -ESOCKTNOSUPPORT when handling the forward ACK in a
> three-way handshake.
> Fix it by only applying the reuseport check for full sockets.
> Fixes: cf7fbe660f2d ("bpf: Add socket assign support")
> Signed-off-by: Joe Stringer <>

Applied, thanks!

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