netdev - Re: [PATCH net] ethtool: strset: Fix reply

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Message-ID: <YMt4VaNZOcRZ8xRP@shredder>
Date:   Thu, 17 Jun 2021 19:29:09 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Amit Cohen <amcohen@...dia.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        mkubecek@...e.cz, idosch@...dia.com, Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net] ethtool: strset: Fix reply_size value

On Thu, Jun 17, 2021 at 06:42:52PM +0300, Amit Cohen wrote:
> strset_reply_size() does not take into account the size required for the
> 'ETHTOOL_A_STRSET_STRINGSETS' nested attribute.
> Since commit 4d1fb7cde0cc ("ethtool: add a stricter length check") this
> results in the following warning in the kernel log:
> 
> ethnl cmd 1: calculated reply length 2236, but consumed 2240
> WARNING: CPU: 2 PID: 30549 at net/ethtool/netlink.c:360 ethnl_default_doit+0x29f/0x310
> 
> Add the appropriate size to the calculation.
> 
> Fixes: 71921690f974 ("ethtool: provide string sets with STRSET_GET request")
> Signed-off-by: Amit Cohen <amcohen@...dia.com>
> Reviewed-by: Jiri Pirko <jiri@...dia.com>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> Tested-by: Ido Schimmel <idosch@...dia.com>

Ha, seems this is addressed by commit e175aef90269 ("ethtool: strset:
fix message length calculation") in net.git which actually motivated
commit 4d1fb7cde0cc ("ethtool: add a stricter length check").

The former is still not in net-next.git, which is why the warning is
triggered there.

The patch can be dropped.