rxrpc: Fix key reference count leak from call->key

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@54321
1bffe9cd I--Q--i 8053480 4169w 3b010000  1000  1000 rxrpc     afs@54321: ka
$

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

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

Fixes: f3441d4125fc ("rxrpc: Copy client call parameters into rxrpc_call earlier")
Signed-off-by: Anderson Nascimento <anderson@allelesecurity.com>
Co-developed-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
cc: stable@kernel.org
Link: https://patch.msgid.link/20260408121252.2249051-9-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 59329cfe15322c81fbc0e9fab2d54ea63798fae1..f035f486c139735b19bb59690ae2f1c1c31506ff 100644 (file)
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -692,6 +692,7 @@ 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);
 }