net: sctp, forbid negative length

[cascardo/linux.git] / net / sctp / socket.c

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fb02c70..9fbb6fe 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4687,7 +4687,7 @@ static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
                                  int __user *optlen)
 {
-       if (len <= 0)
+       if (len == 0)
                return -EINVAL;
        if (len > sizeof(struct sctp_event_subscribe))
                len = sizeof(struct sctp_event_subscribe);
@@ -6430,6 +6430,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
        if (get_user(len, optlen))
                return -EFAULT;
 
+       if (len < 0)
+               return -EINVAL;
+
        lock_sock(sk);
 
        switch (optname) {