[PATCH net] udp6: fix encap return code for resubmitting

[Paolo Abeni]

The commit eb63f2964dbe ("udp6: add missing checks on edumux packet
processing") used the same return code convention of the ipv4 counterpart,
but ipv6 uses the opposite one: positive values means resubmit.

This change addresses the issue, using positive return value for
resubmitting. Also update the related comment, which was broken, too.

Fixes: eb63f2964dbe ("udp6: add missing checks on edumux packet processing")
Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
Note: I could not find any in kernel udp6 encap using the above
feature, that would explain why nobody complained so far...
---
 net/ipv6/udp.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 28c4aa5078fc..b36694b6716e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -766,11 +766,9 @@ static int udp6_unicast_rcv_skb(struct sock *sk, struct 
sk_buff *skb,
 
        ret = udpv6_queue_rcv_skb(sk, skb);
 
-       /* a return value > 0 means to resubmit the input, but
-        * it wants the return to be -protocol, or 0
-        */
+       /* a return value > 0 means to resubmit the input */
        if (ret > 0)
-               return -ret;
+               return ret;
        return 0;
 }
 
-- 
2.17.2