net: netlink: Fix multicast group storage allocation for families with more than...

[cascardo/linux.git] / net / netlink / genetlink.c

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index bc0e504..a992083 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -185,7 +185,7 @@ static int genl_allocate_reserve_groups(int n_groups, int *first_id)
                        }
                }
 
-               if (id >= mc_groups_longs * BITS_PER_LONG) {
+               if (id + n_groups >= mc_groups_longs * BITS_PER_LONG) {
                        unsigned long new_longs = mc_groups_longs +
                                                  BITS_TO_LONGS(n_groups);
                        size_t nlen = new_longs * sizeof(unsigned long);