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tipc: fix broadcast wakeup contention after congestion 

commit 908344cdda ("tipc: fix bug in multicast congestion handling")
introduced a race in the broadcast link wakeup functionality.

This patch eliminates this broadcast link wakeup race caused by
operation on the wakeup list without proper locking. If this race
hit and corrupted the list all subsequent wakeup messages would be
lost, resulting in a considerable memory leak.

Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Alpe 2014-12-10 09:46:54 +01:00 committed by David S. Miller
parent 4f675eb2a7
commit 340b6e59fb
2 changed files with 5 additions and 5 deletions
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8
net/tipc/link.c
View File

@ -293,7 +293,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
l_ptr->next_out_no = 1;
__skb_queue_head_init(&l_ptr->outqueue);
__skb_queue_head_init(&l_ptr->deferred_queue);
__skb_queue_head_init(&l_ptr->waiting_sks);
skb_queue_head_init(&l_ptr->waiting_sks);
link_reset_statistics(l_ptr);
@ -358,7 +358,7 @@ static bool link_schedule_user(struct tipc_link *link, u32 oport,
return false;
TIPC_SKB_CB(buf)->chain_sz = chain_sz;
TIPC_SKB_CB(buf)->chain_imp = imp;
__skb_queue_tail(&link->waiting_sks, buf);
skb_queue_tail(&link->waiting_sks, buf);
link->stats.link_congs++;
return true;
}
@ -378,8 +378,8 @@ static void link_prepare_wakeup(struct tipc_link *link)
if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp])
break;
pend_qsz += TIPC_SKB_CB(skb)->chain_sz;
__skb_unlink(skb, &link->waiting_sks);
__skb_queue_tail(&link->owner->waiting_sks, skb);
skb_unlink(skb, &link->waiting_sks);
skb_queue_tail(&link->owner->waiting_sks, skb);
}
}

2
net/tipc/node.c
View File

@ -115,7 +115,7 @@ struct tipc_node *tipc_node_create(u32 addr)
INIT_LIST_HEAD(&n_ptr->list);
INIT_LIST_HEAD(&n_ptr->publ_list);
INIT_LIST_HEAD(&n_ptr->conn_sks);
__skb_queue_head_init(&n_ptr->waiting_sks);
skb_queue_head_init(&n_ptr->waiting_sks);
__skb_queue_head_init(&n_ptr->bclink.deferred_queue);
hlist_add_head_rcu(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);