ip6mr: only set ip6mr_table from setsockopt when ip6mr_new_table succeeds

Currently, raw6_sk(sk)->ip6mr_table is set unconditionally during
ip6_mroute_setsockopt(MRT6_TABLE). A subsequent attempt at the same
setsockopt will fail with -ENOENT, since we haven't actually created
that table.

A similar fix for ipv4 was included in commit 5e1859fbcc3c ("ipv4: ipmr:
various fixes and cleanups").

Fixes: d1db275dd3f6 ("ipv6: ip6mr: support multiple tables")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 20a419ee8000..5c57374850b3 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1760,7 +1760,8 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
                 ret = 0;
                 if (!ip6mr_new_table(net, v))
                         ret = -ENOMEM;
-                raw6_sk(sk)->ip6mr_table = v;
+                else
+                        raw6_sk(sk)->ip6mr_table = v;
                 rtnl_unlock();
                 return ret;
         }