netdev - Re: [PATCH net] udp: fix the len check in udp_lib

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Message-ID: <54cb4e46-28f9-b6db-85ec-f67df1e6bacf@gmail.com>
Date:   Fri, 28 May 2021 19:57:30 -0600
From:   David Ahern <dsahern@...il.com>
To:     Xin Long <lucien.xin@...il.com>, Jakub Kicinski <kuba@...nel.org>
Cc:     network dev <netdev@...r.kernel.org>, davem <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net] udp: fix the len check in udp_lib_getsockopt

On 5/28/21 7:47 PM, Xin Long wrote:
> The partial byte(or even 0) of the value returned due to passing a wrong
> optlen should be considered as an error. "On error, -1 is returned, and
> errno is set appropriately.". Success returned in that case only confuses
> the user.

It is feasible that some app could use bool or u8 for options that have
0 or 1 values and that code has so far worked. This change would break that.