sctp: pass a kernel pointer to sctp_setsockopt_adaptation_layer

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index cc7d543..b29452f 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3336,17 +3336,14 @@ static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
        return err;
 }
 
-static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
+static int sctp_setsockopt_adaptation_layer(struct sock *sk,
+                                           struct sctp_setadaptation *adapt,
                                            unsigned int optlen)
 {
-       struct sctp_setadaptation adaptation;
-
        if (optlen != sizeof(struct sctp_setadaptation))
                return -EINVAL;
-       if (copy_from_user(&adaptation, optval, optlen))
-               return -EFAULT;
 
-       sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
+       sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
 
        return 0;
 }
@@ -4700,7 +4697,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
                retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
                break;
        case SCTP_ADAPTATION_LAYER:
-               retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
+               retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
                break;
        case SCTP_CONTEXT:
                retval = sctp_setsockopt_context(sk, optval, optlen);