netdev - Re: [PATCH v2 net-next] tcp-zerocopy: Update returned getsockopt() optlen.

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Date:   Wed, 26 Feb 2020 20:24:53 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     arjunroy.kdev@...il.com
Cc:     netdev@...r.kernel.org, arjunroy@...gle.com, soheil@...gle.com,
        edumazet@...gle.com, willemb@...gle.com
Subject: Re: [PATCH v2 net-next] tcp-zerocopy: Update returned getsockopt()
 optlen.

From: Arjun Roy <arjunroy.kdev@...il.com>
Date: Tue, 25 Feb 2020 12:38:54 -0800

> From: Arjun Roy <arjunroy@...gle.com>
> 
> TCP receive zerocopy currently does not update the returned optlen for
> getsockopt() if the user passed in a larger than expected value.
> Thus, userspace cannot properly determine if all the fields are set in
> the passed-in struct. This patch sets the optlen for this case before
> returning, in keeping with the expected operation of getsockopt().
> 
> Fixes: c8856c051454 ("tcp-zerocopy: Return inq along with tcp receive zerocopy.")
> Signed-off-by: Arjun Roy <arjunroy@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied, thank you.