genetlink: fix genlmsg_multicast() bug

[~andy/linux] / net / netlink / genetlink.c

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 7dbc4f732c75a1ae7b18a59f07acbab5743c9e7f..4518a57aa5febb14db1c1d750f217102dd8fd2a9 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1045,7 +1045,7 @@ static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group,
 int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb,
                            u32 portid, unsigned int group, gfp_t flags)
 {
-       if (group >= family->n_mcgrps)
+       if (WARN_ON_ONCE(group >= family->n_mcgrps))
                return -EINVAL;
        group = family->mcgrp_offset + group;
        return genlmsg_mcast(skb, portid, group, flags);
@@ -1062,7 +1062,7 @@ void genl_notify(struct genl_family *family,
        if (nlh)
                report = nlmsg_report(nlh);
 
-       if (group >= family->n_mcgrps)
+       if (WARN_ON_ONCE(group >= family->n_mcgrps))
                return;
        group = family->mcgrp_offset + group;
        nlmsg_notify(sk, skb, portid, group, report, flags);