linux-kernel - Re: [PATCH] sctp: Fix COMM_LOST/CANT_STR_ASSOC err reporting on big-endian platforms

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Message-ID: <20201102132717.GI11030@localhost.localdomain>
Date:   Mon, 2 Nov 2020 10:27:17 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Petr Malat <oss@...at.biz>
Cc:     linux-sctp@...r.kernel.org, Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sctp: Fix COMM_LOST/CANT_STR_ASSOC err reporting on
 big-endian platforms

On Fri, Oct 30, 2020 at 02:26:33PM +0100, Petr Malat wrote:
> Commit 978aa0474115 ("sctp: fix some type cast warnings introduced since
> very beginning")' broke err reading from sctp_arg, because it reads the
> value as 32-bit integer, although the value is stored as 16-bit integer.
> Later this value is passed to the userspace in 16-bit variable, thus the
> user always gets 0 on big-endian platforms. Fix it by reading the __u16
> field of sctp_arg union, as reading err field would produce a sparse
> warning.

Makes sense.

> 
> Signed-off-by: Petr Malat <oss@...at.biz>

Then, it also needs:
Fixes: 978aa0474115 ("sctp: fix some type cast warnings introduced since very beginning")'

Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
(If the maintainers can't add the Fixes tag above, please keep the ack
on the v2)

Thanks.