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

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Date:   Sat, 07 Jul 2018 20:07:09 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     jiri@...lanox.com, idosch@...lanox.com, petrm@...lanox.com,
        arkadis@...lanox.com, dsahern@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] mlxsw: spectrum_router: avoid uninitialized
 variable access

From: Arnd Bergmann <arnd@...db.de>
Date: Fri,  6 Jul 2018 14:44:45 +0200

> 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>

Applied.