linux-kernel - [PATCH 5.4 42/70] rxrpc: Fix rxrpc_local leak in rxrpc_lookup

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Message-Id: <20211206145553.391929442@linuxfoundation.org>
Date:   Mon,  6 Dec 2021 15:56:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Eiichi Tsukata <eiichi.tsukata@...anix.com>,
        David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        linux-afs@...ts.infradead.org
Subject: [PATCH 5.4 42/70] rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()

From: Eiichi Tsukata <eiichi.tsukata@...anix.com>

commit beacff50edbd6c9659a6f15fc7f6126909fade29 upstream.

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: 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@...anix.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
Link: https://lore.kernel.org/all/20211121041608.133740-2-eiichi.tsukata@nutanix.com/ # v1
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/rxrpc/peer_object.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/net/rxrpc/peer_object.c
+++ b/net/rxrpc/peer_object.c
@@ -297,6 +297,12 @@ static struct rxrpc_peer *rxrpc_create_p
 	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
@@ -363,7 +369,7 @@ struct rxrpc_peer *rxrpc_lookup_peer(str
 		spin_unlock_bh(&rxnet->peer_hash_lock);
 
 		if (peer)
-			kfree(candidate);
+			rxrpc_free_peer(candidate);
 		else
 			peer = candidate;
 	}
@@ -418,8 +424,7 @@ static void __rxrpc_put_peer(struct rxrp
 	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);
 }
 
 /*
@@ -455,8 +460,7 @@ void rxrpc_put_peer_locked(struct rxrpc_
 	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);
 	}
 }