[PATCH 49/49] sctp: pass a kernel pointer to sctp_setsockopt_pf_expose

[Christoph Hellwig <hch@xxxxxx>]

Use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 net/sctp/socket.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index f9f4776b0bbfd..ec87ac9965a01 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4378,33 +4378,27 @@ static int sctp_setsockopt_ecn_supported(struct sock *sk,
 }
 
 static int sctp_setsockopt_pf_expose(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;
-	}
 
-	if (params.assoc_value > SCTP_PF_EXPOSE_MAX)
+	if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
 		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;
 
 	if (asoc)
-		asoc->pf_expose = params.assoc_value;
+		asoc->pf_expose = params->assoc_value;
 	else
-		sctp_sk(sk)->pf_expose = params.assoc_value;
+		sctp_sk(sk)->pf_expose = params->assoc_value;
 	retval = 0;
 
 out:
@@ -4628,7 +4622,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 		retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
 		break;
 	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
-		retval = sctp_setsockopt_pf_expose(sk, optval, optlen);
+		retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
 		break;
 	default:
 		retval = -ENOPROTOOPT;
-- 
2.26.2