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rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 

Need to call rxrpc_put_local() for peer candidate before kfree() as it
holds a ref to rxrpc_local.

[DH: v2: Changed to abstract the peer freeing code out into a function]

Fixes: 9ebeddef58 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/all/20211121041608.133740-2-eiichi.tsukata@nutanix.com/ # v1
This commit is contained in:
Eiichi Tsukata 2021-11-21 04:16:08 +00:00 committed by David Howells
parent ca77fba821
commit beacff50ed
1 changed files with 9 additions and 5 deletions
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14
net/rxrpc/peer_object.c
View File

@ -299,6 +299,12 @@ static struct rxrpc_peer *rxrpc_create_peer(struct rxrpc_sock *rx,
return peer;
}
static void rxrpc_free_peer(struct rxrpc_peer *peer)
{
rxrpc_put_local(peer->local);
kfree_rcu(peer, rcu);
}
/*
* Set up a new incoming peer. There shouldn't be any other matching peers
* since we've already done a search in the list from the non-reentrant context
@ -365,7 +371,7 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx,
spin_unlock_bh(&rxnet->peer_hash_lock);
if (peer)
kfree(candidate);
rxrpc_free_peer(candidate);
else
peer = candidate;
}
@ -420,8 +426,7 @@ static void __rxrpc_put_peer(struct rxrpc_peer *peer)
list_del_init(&peer->keepalive_link);
spin_unlock_bh(&rxnet->peer_hash_lock);
rxrpc_put_local(peer->local);
kfree_rcu(peer, rcu);
rxrpc_free_peer(peer);
}
/*
@ -457,8 +462,7 @@ void rxrpc_put_peer_locked(struct rxrpc_peer *peer)
if (n == 0) {
hash_del_rcu(&peer->hash_link);
list_del_init(&peer->keepalive_link);
rxrpc_put_local(peer->local);
kfree_rcu(peer, rcu);
rxrpc_free_peer(peer);
}
}