net: tipc: fix a missing check of nla_nest_start

nla_nest_start could fail and requires a check. The fix returns
-EMSGSIZE if it fails.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tipc/group.c b/net/tipc/group.c
index 06fee14..63f3920 100644 (file)
--- a/net/tipc/group.c
+++ b/net/tipc/group.c
@@ -919,6 +919,9 @@ int tipc_group_fill_sock_diag(struct tipc_group *grp, struct sk_buff *skb)
 {
        struct nlattr *group = nla_nest_start(skb, TIPC_NLA_SOCK_GROUP);
 
+       if (!group)
+               return -EMSGSIZE;
+
        if (nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_ID,
                        grp->type) ||
            nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_INSTANCE,