rxrpc: Validate the net address given to rxrpc_kernel_begin_call()

Validate the net address given to rxrpc_kernel_begin_call() before using
it.

Whilst this should be mostly unnecessary for in-kernel users, it does clear
the tail of the address struct in case we want to hash or compare the whole
thing.

Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 408bd024125bdb17eb781f45030b6a5b86dbd36b..b29bb50af5de8ff2d08cf4063c5828987a471ef2 100644 (file)
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -280,9 +280,14 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
        struct rxrpc_transport *trans;
        struct rxrpc_call *call;
        struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+       int ret;
 
        _enter(",,%x,%lx", key_serial(key), user_call_ID);
 
+       ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
+       if (ret < 0)
+               return ERR_PTR(ret);
+
        lock_sock(&rx->sk);
 
        if (!key)