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net: dsa: properly check for the bridge_leave methods in dsa_switch_bridge_leave()

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commit bcb9928a15 upstream.

This was not caught because there is no switch driver which implements
the .port_bridge_join but not .port_bridge_leave method, but it should
nonetheless be fixed, as in certain conditions (driver development) it
might lead to NULL pointer dereference.

Fixes: f66a6a69f9 ("net: dsa: permit cross-chip bridging between all trees in the system")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vladimir Oltean 2021-07-13 12:40:21 +03:00 committed by Greg Kroah-Hartman
parent a915379594
commit d7243e2ab1
1 changed files with 2 additions and 2 deletions
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4
net/dsa/switch.c
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@ -110,11 +110,11 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
int err, port;
if (dst->index == info->tree_index && ds->index == info->sw_index &&
ds->ops->port_bridge_join)
ds->ops->port_bridge_leave)
ds->ops->port_bridge_leave(ds, info->port, info->br);
if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
ds->ops->crosschip_bridge_join)
ds->ops->crosschip_bridge_leave)
ds->ops->crosschip_bridge_leave(ds, info->tree_index,
info->sw_index, info->port,
info->br);