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[193.12.47.89]) by smtp.gmail.com with ESMTPSA id t12sm1009115ljj.118.2022.01.24.13.10.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jan 2022 13:10:03 -0800 (PST) From: Tobias Waldekranz To: davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean , linux-kernel@vger.kernel.org Subject: [PATCH net 2/2] net: dsa: Avoid cross-chip syncing of VLAN filtering Date: Mon, 24 Jan 2022 22:09:44 +0100 Message-Id: <20220124210944.3749235-3-tobias@waldekranz.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220124210944.3749235-1-tobias@waldekranz.com> References: <20220124210944.3749235-1-tobias@waldekranz.com> MIME-Version: 1.0 Organization: Westermo Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Changes to VLAN filtering are not applicable to cross-chip notifications. On a system like this: .-----. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | '-1-2-' '-1-2-' '-1-2-' Before this change, upon sw1p1 leaving a bridge, a call to dsa_port_vlan_filtering would also be made to sw2p1 and sw3p1. In this scenario: .---------. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | '-1-2-3-4-' '-1-2-' '-1-2-' When sw1p4 would leave a bridge, dsa_port_vlan_filtering would be called for sw2 and sw3 with a non-existing port - leading to array out-of-bounds accesses and crashes on mv88e6xxx. Fixes: d371b7c92d19 ("net: dsa: Unset vlan_filtering when ports leave the bridge") Signed-off-by: Tobias Waldekranz Reviewed-by: Vladimir Oltean --- net/dsa/switch.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/dsa/switch.c b/net/dsa/switch.c index 9f9b70d6070a..517cc83d13cc 100644 --- a/net/dsa/switch.c +++ b/net/dsa/switch.c @@ -180,9 +180,11 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds, info->sw_index, info->port, info->bridge); - err = dsa_switch_sync_vlan_filtering(ds, info); - if (err) - return err; + if (ds->dst->index == info->tree_index && ds->index == info->sw_index) { + err = dsa_switch_sync_vlan_filtering(ds, info); + if (err) + return err; + } return dsa_tag_8021q_bridge_leave(ds, info); }