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

[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 | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index f9f4776b0bbfd..ec87ac9965a01 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4378,33 +4378,27 @@ static int sctp_setsockopt_ecn_supported(struct sock 
*sk,
 }
 
 static int sctp_setsockopt_pf_expose(struct sock *sk,
-                                    char __user *optval,
+                                    struct sctp_assoc_value *params,
                                     unsigned int optlen)
 {
-       struct sctp_assoc_value params;
        struct sctp_association *asoc;
        int retval = -EINVAL;
 
-       if (optlen != sizeof(params))
-               goto out;
-
-       if (copy_from_user(&params, optval, optlen)) {
-               retval = -EFAULT;
+       if (optlen != sizeof(*params))
                goto out;
-       }
 
-       if (params.assoc_value > SCTP_PF_EXPOSE_MAX)
+       if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
                goto out;
 
-       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))
                goto out;
 
        if (asoc)
-               asoc->pf_expose = params.assoc_value;
+               asoc->pf_expose = params->assoc_value;
        else
-               sctp_sk(sk)->pf_expose = params.assoc_value;
+               sctp_sk(sk)->pf_expose = params->assoc_value;
        retval = 0;
 
 out:
@@ -4628,7 +4622,7 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
                retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
                break;
        case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
-               retval = sctp_setsockopt_pf_expose(sk, optval, optlen);
+               retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
                break;
        default:
                retval = -ENOPROTOOPT;
-- 
2.26.2