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

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Message-ID: <CADvbK_endt5VLzyDMumn6ks8oF5WkQ0hbx6XguyRbJZzOf4K5A@mail.gmail.com>
Date:   Sat, 29 May 2021 12:47:52 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        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 Fri, May 28, 2021 at 9:57 PM David Ahern <dsahern@...il.com> wrote:
>
> 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.
Got it.
Not sure if it's possible or necessary to also return -EINVAL if optlen == 0