sctp: pass a kernel pointer to sctp_setsockopt_reconfig_supported

Use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/socket.c

@@ -3996,27 +3996,21 @@ static int sctp_setsockopt_default_prinfo(struct sock *sk,
 }
 
 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
-					      char __user *optval,
+					      struct sctp_assoc_value *params,
 					      unsigned int optlen)
 {
-	struct sctp_assoc_value params;
 	struct sctp_association *asoc;
 	int retval = -EINVAL;
 
-	if (optlen != sizeof(params))
-		goto out;
-
-	if (copy_from_user(&params, optval, optlen)) {
-		retval = -EFAULT;
+	if (optlen != sizeof(*params))
 		goto out;
-	}
 
-	asoc = sctp_id2assoc(sk, params.assoc_id);
-	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
+	asoc = sctp_id2assoc(sk, params->assoc_id);
+	if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
 	    sctp_style(sk, UDP))
 		goto out;
 
-	sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
+	sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
 
 	retval = 0;
 
@@ -4688,7 +4682,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 		retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
 		break;
 	case SCTP_RECONFIG_SUPPORTED:
-		retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
+		retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
 		break;
 	case SCTP_ENABLE_STREAM_RESET:
 		retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);