[PATCH 10/51] sctp: pass a kernel pointer to sctp_setsockopt_initmsg

[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 | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index deccfe54d2fc7d..d62c02d0b79346 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2832,24 +2832,22 @@ static int sctp_setsockopt_delayed_ack(struct sock *sk,
  * by the change).  With TCP-style sockets, this option is inherited by
  * sockets derived from a listener socket.
  */
-static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, 
unsigned int optlen)
+static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
+                                  unsigned int optlen)
 {
-       struct sctp_initmsg sinit;
        struct sctp_sock *sp = sctp_sk(sk);
 
        if (optlen != sizeof(struct sctp_initmsg))
                return -EINVAL;
-       if (copy_from_user(&sinit, optval, optlen))
-               return -EFAULT;
 
-       if (sinit.sinit_num_ostreams)
-               sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
-       if (sinit.sinit_max_instreams)
-               sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
-       if (sinit.sinit_max_attempts)
-               sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
-       if (sinit.sinit_max_init_timeo)
-               sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
+       if (sinit->sinit_num_ostreams)
+               sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
+       if (sinit->sinit_max_instreams)
+               sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
+       if (sinit->sinit_max_attempts)
+               sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
+       if (sinit->sinit_max_init_timeo)
+               sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
 
        return 0;
 }
@@ -4694,7 +4692,7 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
                break;
 
        case SCTP_INITMSG:
-               retval = sctp_setsockopt_initmsg(sk, optval, optlen);
+               retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
                break;
        case SCTP_DEFAULT_SEND_PARAM:
                retval = sctp_setsockopt_default_send_param(sk, optval,
-- 
2.27.0