[PATCH net v2 1/2] ip6mr: only set ip6mr_table from setsockopt when ip6mr_new_table succeeds

[Sabrina Dubroca]

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 <s...@queasysnail.net>
---
 net/ipv6/ip6mr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 298fd8b6ed17..42eca2689c3b 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1759,7 +1759,8 @@ 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;
        }
-- 
2.17.1