netdev - Re: [PATCH net-next] mlxsw: spectrum_router: avoid uninitialized variable access

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Date:   Fri, 6 Jul 2018 16:16:32 +0300
From:   Ido Schimmel <idosch@...lanox.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Petr Machata <petrm@...lanox.com>,
        Arkadi Sharshevsky <arkadis@...lanox.com>,
        David Ahern <dsahern@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] mlxsw: spectrum_router: avoid uninitialized
 variable access

On Fri, Jul 06, 2018 at 02:44:45PM +0200, Arnd Bergmann wrote:
> When CONFIG_BRIDGE_VLAN_FILTERING is disabled, gcc correctly points out
> that the 'vid' variable is uninitialized whenever br_vlan_get_pvid
> returns an error:
> 
> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c: In function 'mlxsw_sp_rif_vlan_fid_get':
> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:6881:6: error: 'vid' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This changes the condition check to always return -EINVAL here,
> which I guess is what the author intended here.
> 
> Fixes: e6f1960ae6c7 ("mlxsw: spectrum_router: Allocate FID according to PVID")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Ido Schimmel <idosch@...lanox.com>

Thanks!