sctp: Fix regression introduced by new sctp_connectx api

A new (unrealeased to the user) sctp_connectx api

c6ba68a26645dbc5029a9faa5687ebe6fcfc53e4
    sctp: support non-blocking version of the new sctp_connectx() API

introduced a regression cought by the user regression test
suite.  In particular, the API requires the user library to
re-allocate the buffer and could potentially trigger a SIGFAULT.

This change corrects that regression by passing the original
address buffer to the kernel unmodified, but still allows for
a returned association id.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index bf705ba..3a95fcb 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1276,22 +1276,30 @@ SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
 }
 
 /*
- * New (hopefully final) interface for the API.  The option buffer is used
- * both for the returned association id and the addresses.
+ * New (hopefully final) interface for the API.
+ * We use the sctp_getaddrs_old structure so that use-space library
+ * can avoid any unnecessary allocations.   The only defferent part
+ * is that we store the actual length of the address buffer into the
+ * addrs_num structure member.  That way we can re-use the existing
+ * code.
  */
 SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
                                        char __user *optval,
                                        int __user *optlen)
 {
+       struct sctp_getaddrs_old param;
        sctp_assoc_t assoc_id = 0;
        int err = 0;
 
-       if (len < sizeof(assoc_id))
+       if (len < sizeof(param))
                return -EINVAL;
 
+       if (copy_from_user(&param, optval, sizeof(param)))
+               return -EFAULT;
+
        err = __sctp_setsockopt_connectx(sk,
-                       (struct sockaddr __user *)(optval + sizeof(assoc_id)),
-                       len - sizeof(assoc_id), &assoc_id);
+                       (struct sockaddr __user *)param.addrs,
+                       param.addr_num, &assoc_id);
 
        if (err == 0 || err == -EINPROGRESS) {
                if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))