[PATCH 41/49] sctp: pass a kernel pointer to sctp_setsockopt_scheduler

[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 | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 84881913dbc7f..122e6b95a8f0d 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4111,44 +4111,39 @@ static int sctp_setsockopt_add_streams(struct sock *sk,
 }
 
 static int sctp_setsockopt_scheduler(struct sock *sk,
-                                    char __user *optval,
+                                    struct sctp_assoc_value *params,
                                     unsigned int optlen)
 {
        struct sctp_sock *sp = sctp_sk(sk);
        struct sctp_association *asoc;
-       struct sctp_assoc_value params;
        int retval = 0;
 
-       if (optlen < sizeof(params))
+       if (optlen < sizeof(*params))
                return -EINVAL;
 
-       optlen = sizeof(params);
-       if (copy_from_user(&params, optval, optlen))
-               return -EFAULT;
-
-       if (params.assoc_value > SCTP_SS_MAX)
+       if (params->assoc_value > SCTP_SS_MAX)
                return -EINVAL;
 
-       asoc = sctp_id2assoc(sk, params.assoc_id);
-       if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
+       asoc = sctp_id2assoc(sk, params->assoc_id);
+       if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
            sctp_style(sk, UDP))
                return -EINVAL;
 
        if (asoc)
-               return sctp_sched_set_sched(asoc, params.assoc_value);
+               return sctp_sched_set_sched(asoc, params->assoc_value);
 
        if (sctp_style(sk, TCP))
-               params.assoc_id = SCTP_FUTURE_ASSOC;
+               params->assoc_id = SCTP_FUTURE_ASSOC;
 
-       if (params.assoc_id == SCTP_FUTURE_ASSOC ||
-           params.assoc_id == SCTP_ALL_ASSOC)
-               sp->default_ss = params.assoc_value;
+       if (params->assoc_id == SCTP_FUTURE_ASSOC ||
+           params->assoc_id == SCTP_ALL_ASSOC)
+               sp->default_ss = params->assoc_value;
 
-       if (params.assoc_id == SCTP_CURRENT_ASSOC ||
-           params.assoc_id == SCTP_ALL_ASSOC) {
+       if (params->assoc_id == SCTP_CURRENT_ASSOC ||
+           params->assoc_id == SCTP_ALL_ASSOC) {
                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
                        int ret = sctp_sched_set_sched(asoc,
-                                                      params.assoc_value);
+                                                      params->assoc_value);
 
                        if (ret && !retval)
                                retval = ret;
@@ -4656,7 +4651,7 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
                retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
                break;
        case SCTP_STREAM_SCHEDULER:
-               retval = sctp_setsockopt_scheduler(sk, optval, optlen);
+               retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
                break;
        case SCTP_STREAM_SCHEDULER_VALUE:
                retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
-- 
2.26.2