[PATCH 35/49] sctp: pass a kernel pointer to sctp_setsockopt_default_prinfo

[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 | 45 ++++++++++++++++++++-------------------------
 1 file changed, 20 insertions(+), 25 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fb7ed11382af1..6136f863095ef 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3940,55 +3940,50 @@ static int sctp_setsockopt_pr_supported(struct sock *sk,
 }
 
 static int sctp_setsockopt_default_prinfo(struct sock *sk,
-                                         char __user *optval,
+                                         struct sctp_default_prinfo *info,
                                          unsigned int optlen)
 {
        struct sctp_sock *sp = sctp_sk(sk);
-       struct sctp_default_prinfo info;
        struct sctp_association *asoc;
        int retval = -EINVAL;
 
-       if (optlen != sizeof(info))
-               goto out;
-
-       if (copy_from_user(&info, optval, sizeof(info))) {
-               retval = -EFAULT;
+       if (optlen != sizeof(*info))
                goto out;
-       }
 
-       if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
+       if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
                goto out;
 
-       if (info.pr_policy == SCTP_PR_SCTP_NONE)
-               info.pr_value = 0;
+       if (info->pr_policy == SCTP_PR_SCTP_NONE)
+               info->pr_value = 0;
 
-       asoc = sctp_id2assoc(sk, info.pr_assoc_id);
-       if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
+       asoc = sctp_id2assoc(sk, info->pr_assoc_id);
+       if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
            sctp_style(sk, UDP))
                goto out;
 
        retval = 0;
 
        if (asoc) {
-               SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
-               asoc->default_timetolive = info.pr_value;
+               SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
+               asoc->default_timetolive = info->pr_value;
                goto out;
        }
 
        if (sctp_style(sk, TCP))
-               info.pr_assoc_id = SCTP_FUTURE_ASSOC;
+               info->pr_assoc_id = SCTP_FUTURE_ASSOC;
 
-       if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
-           info.pr_assoc_id == SCTP_ALL_ASSOC) {
-               SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
-               sp->default_timetolive = info.pr_value;
+       if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
+           info->pr_assoc_id == SCTP_ALL_ASSOC) {
+               SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
+               sp->default_timetolive = info->pr_value;
        }
 
-       if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
-           info.pr_assoc_id == SCTP_ALL_ASSOC) {
+       if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
+           info->pr_assoc_id == SCTP_ALL_ASSOC) {
                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
-                       SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
-                       asoc->default_timetolive = info.pr_value;
+                       SCTP_PR_SET_POLICY(asoc->default_flags,
+                                          info->pr_policy);
+                       asoc->default_timetolive = info->pr_value;
                }
        }
 
@@ -4686,7 +4681,7 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
                retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
                break;
        case SCTP_DEFAULT_PRINFO:
-               retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
+               retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
                break;
        case SCTP_RECONFIG_SUPPORTED:
                retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
-- 
2.26.2