[PATCH 37/49] sctp: pass a kernel pointer to sctp_setsockopt_enable_strreset

[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 | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9173b1b80ee17..c5a4e9375bb55 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4015,48 +4015,42 @@ static int sctp_setsockopt_reconfig_supported(struct 
sock *sk,
 }
 
 static int sctp_setsockopt_enable_strreset(struct sock *sk,
-                                          char __user *optval,
+                                          struct sctp_assoc_value *params,
                                           unsigned int optlen)
 {
        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
-       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_ENABLE_STRRESET_MASK))
+       if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
                goto out;
 
-       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))
                goto out;
 
        retval = 0;
 
        if (asoc) {
-               asoc->strreset_enable = params.assoc_value;
+               asoc->strreset_enable = params->assoc_value;
                goto out;
        }
 
        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)
-               ep->strreset_enable = params.assoc_value;
+       if (params->assoc_id == SCTP_FUTURE_ASSOC ||
+           params->assoc_id == SCTP_ALL_ASSOC)
+               ep->strreset_enable = 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, &ep->asocs, asocs)
-                       asoc->strreset_enable = params.assoc_value;
+                       asoc->strreset_enable = params->assoc_value;
 
 out:
        return retval;
@@ -4681,7 +4675,7 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
                retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
                break;
        case SCTP_ENABLE_STREAM_RESET:
-               retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
+               retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
                break;
        case SCTP_RESET_STREAMS:
                retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
-- 
2.26.2