[PATCH net 0/2] rxrpc: Leak fixes

[PATCH net 0/2] rxrpc: Leak fixes

[David Howells]

Here are a couple of fixes for leaks in AF_RXRPC:

 (1) Fix a leak of rxrpc_peer structs in rxrpc_look_up_bundle().

 (2) Fix a leak of rxrpc_local structs in rxrpc_lookup_peer().

The patches are tagged here:

	git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
	rxrpc-fixes-20211129

and can also be found on the following branch:

	http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-fixes

David
---
Eiichi Tsukata (2):
      rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()
      rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()


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

[PATCH net 1/2] rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()

[David Howells]

From: Eiichi Tsukata <eiichi.tsukata@nutanix.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@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/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);

[PATCH net 2/2] rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()

[David Howells]

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

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@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
---

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

diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c
index 68396d052052..0298fe2ad6d3 100644
--- a/net/rxrpc/peer_object.c
+++ b/net/rxrpc/peer_object.c
@@ -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);
 	}
 }
 

Re: [PATCH net 0/2] rxrpc: Leak fixes

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net.git (master)
by David Howells <dhowells@redhat.com>:

On Mon, 29 Nov 2021 15:49:39 +0000 you wrote:
> Here are a couple of fixes for leaks in AF_RXRPC:
> 
>  (1) Fix a leak of rxrpc_peer structs in rxrpc_look_up_bundle().
> 
>  (2) Fix a leak of rxrpc_local structs in rxrpc_lookup_peer().
> 
> The patches are tagged here:
> 
> [...]

Here is the summary with links:
  - [net,1/2] rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()
    https://git.kernel.org/netdev/net/c/ca77fba82135
  - [net,2/2] rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()
    https://git.kernel.org/netdev/net/c/beacff50edbd

You are awesome, thank you!
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