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-rw-r--r--net/sctp/socket.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index bf705ba9723..3a95fcb17a9 100644
--- 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)))