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net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering

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The "ds" iterator variable used in dsa_port_reset_vlan_filtering() ->
dsa_switch_for_each_port() overwrites the "dp" received as argument,
which is later used to call dsa_port_vlan_filtering() proper.

As a result, switches which do enter that code path (the ones with
vlan_filtering_is_global=true) will dereference an invalid dp in
dsa_port_reset_vlan_filtering() after leaving a VLAN-aware bridge.

Use a dedicated "other_dp" iterator variable to avoid this from
happening.

Fixes: d0004a020b ("net: dsa: remove the "dsa_to_port in a loop" antipattern from the core")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2022-07-15 18:16:59 +03:00 committed by Jakub Kicinski
parent 4db2a5ef4c
commit 1699b4d502
1 changed files with 3 additions and 2 deletions
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5
net/dsa/port.c
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@ -248,6 +248,7 @@ static void dsa_port_reset_vlan_filtering(struct dsa_port *dp,
struct netlink_ext_ack extack = {0};
bool change_vlan_filtering = false;
struct dsa_switch *ds = dp->ds;
struct dsa_port *other_dp;
bool vlan_filtering;
int err;
@ -270,8 +271,8 @@ static void dsa_port_reset_vlan_filtering(struct dsa_port *dp,
* VLAN-aware bridge.
*/
if (change_vlan_filtering && ds->vlan_filtering_is_global) {
dsa_switch_for_each_port(dp, ds) {
struct net_device *br = dsa_port_bridge_dev_get(dp);
dsa_switch_for_each_port(other_dp, ds) {
struct net_device *br = dsa_port_bridge_dev_get(other_dp);
if (br && br_vlan_enabled(br)) {
change_vlan_filtering = false;