[PATCH 34/49] sctp: pass a kernel pointer to sctp_setsockopt_pr_supported

[Christoph Hellwig]

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

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 net/sctp/socket.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fe8d1ea7d9c35..fb7ed11382af1 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3921,24 +3921,20 @@ static int sctp_setsockopt_recvnxtinfo(struct sock *sk, 
int *val,
 }
 
 static int sctp_setsockopt_pr_supported(struct sock *sk,
-                                       char __user *optval,
+                                       struct sctp_assoc_value *params,
                                        unsigned int optlen)
 {
-       struct sctp_assoc_value params;
        struct sctp_association *asoc;
 
-       if (optlen != sizeof(params))
+       if (optlen != sizeof(*params))
                return -EINVAL;
 
-       if (copy_from_user(&params, optval, optlen))
-               return -EFAULT;
-
-       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))
                return -EINVAL;
 
-       sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
+       sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
 
        return 0;
 }
@@ -4687,7 +4683,7 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
                retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
                break;
        case SCTP_PR_SUPPORTED:
-               retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
+               retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
                break;
        case SCTP_DEFAULT_PRINFO:
                retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
-- 
2.26.2