netdev - [PATCH 1/2] rxrpc: Fix rxrpc_peer leak in rxrpc_look_up

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Date:   Wed, 24 Nov 2021 14:37:33 +0000
From:   David Howells <dhowells@...hat.com>
To:     Eiichi Tsukata <eiichi.tsukata@...anix.com>
Cc:     Marc Dionne <marc.dionne@...istor.com>,
        linux-afs@...ts.infradead.org, dhowells@...hat.com,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()

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

Need to call rxrpc_put_peer() for bundle candidate before kfree() as it
holds a ref to rxrpc_peer.

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

Fixes: 245500d853e9 ("rxrpc: Rewrite the client connection manager")
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@...anix.com>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
Link: https://lore.kernel.org/r/20211121041608.133740-1-eiichi.tsukata@nutanix.com/ # v1
---

 net/rxrpc/conn_client.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index dbea0bfee48e..8120138dac01 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -135,16 +135,20 @@ struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *bundle)
 	return bundle;
 }
 
+static void rxrpc_free_bundle(struct rxrpc_bundle *bundle)
+{
+	rxrpc_put_peer(bundle->params.peer);
+	kfree(bundle);
+}
+
 void rxrpc_put_bundle(struct rxrpc_bundle *bundle)
 {
 	unsigned int d = bundle->debug_id;
 	unsigned int u = atomic_dec_return(&bundle->usage);
 
 	_debug("PUT B=%x %u", d, u);
-	if (u == 0) {
-		rxrpc_put_peer(bundle->params.peer);
-		kfree(bundle);
-	}
+	if (u == 0)
+		rxrpc_free_bundle(bundle);
 }
 
 /*
@@ -328,7 +332,7 @@ static struct rxrpc_bundle *rxrpc_look_up_bundle(struct rxrpc_conn_parameters *c
 	return candidate;
 
 found_bundle_free:
-	kfree(candidate);
+	rxrpc_free_bundle(candidate);
 found_bundle:
 	rxrpc_get_bundle(bundle);
 	spin_unlock(&local->client_bundles_lock);