[PATCH net 5/5] rxrpc: Fix key reference count leak from call->key

[David Howells]

From: Anderson Nascimento <anderson at allelesecurity.com>

When creating a client call in rxrpc_alloc_client_call(), the code obtains
a reference to the key.  This is never cleaned up and gets leaked when the
call is destroyed.

Fix this by freeing call->key in rxrpc_destroy_call().

Before the patch, it shows the key reference counter elevated:

$ cat /proc/keys | grep afs at 54321
1bffe9cd I--Q--i 8053480 4169w 3b010000  1000  1000 rxrpc     afs at 54321: ka
$

After the patch, the invalidated key is removed when the code exits:

$ cat /proc/keys | grep afs at 54321
$

Fixes: f3441d4125fc ("rxrpc: Copy client call parameters into rxrpc_call earlier")
Signed-off-by: Anderson Nascimento <anderson at allelesecurity.com>
Co-developed-by: David Howells <dhowells at redhat.com>
Signed-off-by: David Howells <dhowells at redhat.com>
Reviewed-by: Jeffrey Altman <jaltman at auristor.com>
cc: Marc Dionne <marc.dionne at auristor.com>
cc: Eric Dumazet <edumazet at google.com>
cc: "David S. Miller" <davem at davemloft.net>
cc: Jakub Kicinski <kuba at kernel.org>
cc: Paolo Abeni <pabeni at redhat.com>
cc: Simon Horman <horms at kernel.org>
cc: linux-afs at lists.infradead.org
cc: netdev at vger.kernel.org
cc: stable at kernel.org
---
 net/rxrpc/call_object.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 918f41d97a2f..8d874ea428ff 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -694,6 +694,7 @@ static void rxrpc_destroy_call(struct work_struct *work)
 	rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
 	rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
 	rxrpc_put_local(call->local, rxrpc_local_put_call);
+	key_put(call->key);
 	call_rcu(&call->rcu, rxrpc_rcu_free_call);
 }