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kernel: fix crashes in bridge offload code

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- fix an issues when accessing the port pointer of an expired/invalid fdb entry

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 38a5b593ef)
This commit is contained in:
Felix Fietkau 2022-05-31 14:01:21 +02:00 committed by Hauke Mehrtens
parent 33df033b73
commit 8e9eaef70a
1 changed files with 5 additions and 5 deletions
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10
target/linux/generic/hack-5.10/600-bridge_offload.patch
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@ -434,13 +434,13 @@
+ vg = nbp_vlan_group_rcu(inp); + vg = nbp_vlan_group_rcu(inp);
+ vlan = cb->input_vlan_present ? cb->input_vlan_tag : br_get_pvid(vg); + vlan = cb->input_vlan_present ? cb->input_vlan_tag : br_get_pvid(vg);
+ fdb_in = br_fdb_find_rcu(p->br, eth_hdr(skb)->h_source, vlan); + fdb_in = br_fdb_find_rcu(p->br, eth_hdr(skb)->h_source, vlan);
+ if (!fdb_in) + if (!fdb_in || !fdb_in->dst)
+ goto out; + goto out;
+ +
+ vg = nbp_vlan_group_rcu(p); + vg = nbp_vlan_group_rcu(p);
+ vlan = skb_vlan_tag_present(skb) ? skb_vlan_tag_get_id(skb) : br_get_pvid(vg); + vlan = skb_vlan_tag_present(skb) ? skb_vlan_tag_get_id(skb) : br_get_pvid(vg);
+ fdb_out = br_fdb_find_rcu(p->br, eth_hdr(skb)->h_dest, vlan); + fdb_out = br_fdb_find_rcu(p->br, eth_hdr(skb)->h_dest, vlan);
+ if (!fdb_out) + if (!fdb_out || !fdb_out->dst)
+ goto out; + goto out;
+ +
+ br_offload_prepare_key(p, &key, skb); + br_offload_prepare_key(p, &key, skb);
@ -450,7 +450,7 @@
+#endif +#endif
+ +
+ flow = kmem_cache_alloc(offload_cache, GFP_ATOMIC); + flow = kmem_cache_alloc(offload_cache, GFP_ATOMIC);
+ flow->port = fdb_in->dst; + flow->port = inp;
+ memcpy(&flow->key, &key, sizeof(key)); + memcpy(&flow->key, &key, sizeof(key));
+ +
+#ifdef CONFIG_BRIDGE_VLAN_FILTERING +#ifdef CONFIG_BRIDGE_VLAN_FILTERING
@ -465,7 +465,7 @@
+ spin_lock_bh(&offload_lock); + spin_lock_bh(&offload_lock);
+ if (!o->enabled || + if (!o->enabled ||
+ atomic_read(&p->offload.rht.nelems) >= p->br->offload_cache_size || + atomic_read(&p->offload.rht.nelems) >= p->br->offload_cache_size ||
+ rhashtable_insert_fast(&flow->port->offload.rht, &flow->node, flow_params)) { + rhashtable_insert_fast(&inp->offload.rht, &flow->node, flow_params)) {
+ kmem_cache_free(offload_cache, flow); + kmem_cache_free(offload_cache, flow);
+ goto out_unlock; + goto out_unlock;
+ } + }
@ -511,8 +511,8 @@
+#ifdef CONFIG_BRIDGE_VLAN_FILTERING +#ifdef CONFIG_BRIDGE_VLAN_FILTERING
+ cb->input_vlan_present = key.vlan_present != 0; + cb->input_vlan_present = key.vlan_present != 0;
+ cb->input_vlan_tag = key.vlan_tag; + cb->input_vlan_tag = key.vlan_tag;
+ cb->input_ifindex = p->dev->ifindex;
+#endif +#endif
+ cb->input_ifindex = p->dev->ifindex;
+ goto out; + goto out;
+ } + }
+ +