From: Vladimir Oltean Date: Wed, 5 Jan 2022 13:18:11 +0000 (+0200) Subject: net: dsa: fix incorrect function pointer check for MRP ring roles X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ff91e1b68490b97c18c649b769618815eb945f11;p=linux.git net: dsa: fix incorrect function pointer check for MRP ring roles The cross-chip notifier boilerplate code meant to check the presence of ds->ops->port_mrp_add_ring_role before calling it, but checked ds->ops->port_mrp_add instead, before calling ds->ops->port_mrp_add_ring_role. Therefore, a driver which implements one operation but not the other would trigger a NULL pointer dereference. There isn't any such driver in DSA yet, so there is no reason to backport the change. Issue found through code inspection. Cc: Horatiu Vultur Fixes: c595c4330da0 ("net: dsa: add MRP support") Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- diff --git a/net/dsa/switch.c b/net/dsa/switch.c index 393f2d8a860a9..260d8e7d6e5a1 100644 --- a/net/dsa/switch.c +++ b/net/dsa/switch.c @@ -729,7 +729,7 @@ static int dsa_switch_mrp_add_ring_role(struct dsa_switch *ds, struct dsa_notifier_mrp_ring_role_info *info) { - if (!ds->ops->port_mrp_add) + if (!ds->ops->port_mrp_add_ring_role) return -EOPNOTSUPP; if (ds->index == info->sw_index) @@ -743,7 +743,7 @@ static int dsa_switch_mrp_del_ring_role(struct dsa_switch *ds, struct dsa_notifier_mrp_ring_role_info *info) { - if (!ds->ops->port_mrp_del) + if (!ds->ops->port_mrp_del_ring_role) return -EOPNOTSUPP; if (ds->index == info->sw_index)