linux-kernel - Re: [PATCH v2 net] net: switchdev: zero-initialize struct switchdev_notifier_fdb_info emitted by drivers towards the bridge

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Date:   Tue, 10 Aug 2021 14:41:48 +0200
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Vadym Kochan <vkochan@...vell.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Grygorii Strashko <grygorii.strashko@...com>,
        Julian Wiedmann <jwi@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Jianbo Liu <jianbol@...dia.com>,
        Vlad Buslov <vladbu@...dia.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-s390@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Ido Schimmel <idosch@...sch.org>
Subject: Re: [PATCH v2 net] net: switchdev: zero-initialize struct
 switchdev_notifier_fdb_info emitted by drivers towards the bridge

On 10/08/2021 13:50, Vladimir Oltean wrote:
> The blamed commit a new field to struct switchdev_notifier_fdb_info, but
                  ^^^ added?

> did not make sure that all call paths set it to something valid. For
> example, a switchdev driver may emit a SWITCHDEV_FDB_ADD_TO_BRIDGE
> notifier, and since the 'is_local' flag is not set, it contains junk
> from the stack, so the bridge might interpret those notifications as
> being for local FDB entries when that was not intended.
> 
> To avoid that now and in the future, zero-initialize all
> switchdev_notifier_fdb_info structures created by drivers such that all
> newly added fields to not need to touch drivers again.
> 
> Fixes: 2c4eca3ef716 ("net: bridge: switchdev: include local flag in FDB notifications")
> Reported-by: Ido Schimmel <idosch@...sch.org>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> Tested-by: Ido Schimmel <idosch@...dia.com>
> ---
> v1->v2: use an empty struct initializer as opposed to memset, as
>         suggested by Leon Romanovsky

For drivers/s390/net/qeth_l2_main.c :

Reviewed-by: Karsten Graul <kgraul@...ux.ibm.com>

Thanks