sctp: pass a kernel pointer to sctp_setsockopt_del_key

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 02153f2..b692b93 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3703,42 +3703,39 @@ static int sctp_setsockopt_active_key(struct sock *sk,
  * This set option will delete a shared secret key from use.
  */
 static int sctp_setsockopt_del_key(struct sock *sk,
-                                  char __user *optval,
+                                  struct sctp_authkeyid *val,
                                   unsigned int optlen)
 {
        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
        struct sctp_association *asoc;
-       struct sctp_authkeyid val;
        int ret = 0;
 
        if (optlen != sizeof(struct sctp_authkeyid))
                return -EINVAL;
-       if (copy_from_user(&val, optval, optlen))
-               return -EFAULT;
 
-       asoc = sctp_id2assoc(sk, val.scact_assoc_id);
-       if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
+       asoc = sctp_id2assoc(sk, val->scact_assoc_id);
+       if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
            sctp_style(sk, UDP))
                return -EINVAL;
 
        if (asoc)
-               return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
+               return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
 
        if (sctp_style(sk, TCP))
-               val.scact_assoc_id = SCTP_FUTURE_ASSOC;
+               val->scact_assoc_id = SCTP_FUTURE_ASSOC;
 
-       if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
-           val.scact_assoc_id == SCTP_ALL_ASSOC) {
-               ret = sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
+       if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
+           val->scact_assoc_id == SCTP_ALL_ASSOC) {
+               ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
                if (ret)
                        return ret;
        }
 
-       if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
-           val.scact_assoc_id == SCTP_ALL_ASSOC) {
+       if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
+           val->scact_assoc_id == SCTP_ALL_ASSOC) {
                list_for_each_entry(asoc, &ep->asocs, asocs) {
                        int res = sctp_auth_del_key_id(ep, asoc,
-                                                      val.scact_keynumber);
+                                                      val->scact_keynumber);
 
                        if (res && !ret)
                                ret = res;
@@ -4689,7 +4686,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
                retval = sctp_setsockopt_active_key(sk, kopt, optlen);
                break;
        case SCTP_AUTH_DELETE_KEY:
-               retval = sctp_setsockopt_del_key(sk, optval, optlen);
+               retval = sctp_setsockopt_del_key(sk, kopt, optlen);
                break;
        case SCTP_AUTH_DEACTIVATE_KEY:
                retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);