1 files changed, 18 insertions, 20 deletions

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 6efb0e9036b5..e9ef640200b4 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -77,7 +77,8 @@ static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_VFS_DQUOT);
 static unsigned long *mc_groups = &mc_group_start;
 static unsigned long mc_groups_longs = 1;
 
-static int genl_ctrl_event(int event, void *data);
+static int genl_ctrl_event(int event, struct genl_family *family,
+                           struct genl_multicast_group *grp);
 
 static inline unsigned int genl_family_hash(unsigned int id)
 {
@@ -235,9 +236,8 @@ int genl_register_mc_group(struct genl_family *family,
         grp->id = id;
         set_bit(id, mc_groups);
         list_add_tail(&grp->list, &family->mcast_groups);
-        grp->family = family;
 
-        genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, grp);
+        genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family, grp);
  out:
         genl_unlock_all();
         return err;
@@ -248,7 +248,6 @@ static void __genl_unregister_mc_group(struct genl_family *family,
                                        struct genl_multicast_group *grp)
 {
         struct net *net;
-        BUG_ON(grp->family != family);
 
         netlink_table_grab();
         rcu_read_lock();
@@ -260,9 +259,8 @@ static void __genl_unregister_mc_group(struct genl_family *family,
         if (grp->id != 1)
                 clear_bit(grp->id, mc_groups);
         list_del(&grp->list);
-        genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, grp);
+        genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family, grp);
         grp->id = 0;
-        grp->family = NULL;
 }
 
 static void genl_unregister_mc_groups(struct genl_family *family)
@@ -364,7 +362,7 @@ int __genl_register_family(struct genl_family *family)
         list_add_tail(&family->family_list, genl_family_chain(family->id));
         genl_unlock_all();
 
-        genl_ctrl_event(CTRL_CMD_NEWFAMILY, family);
+        genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL);
 
         return 0;
 
@@ -400,7 +398,7 @@ int genl_unregister_family(struct genl_family *family)
                 genl_unlock_all();
 
                 kfree(family->attrbuf);
-                genl_ctrl_event(CTRL_CMD_DELFAMILY, family);
+                genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL);
                 return 0;
         }
 
@@ -693,7 +691,8 @@ nla_put_failure:
         return -EMSGSIZE;
 }
 
-static int ctrl_fill_mcgrp_info(struct genl_multicast_group *grp, u32 portid,
+static int ctrl_fill_mcgrp_info(struct genl_family *family,
+                                struct genl_multicast_group *grp, u32 portid,
                                 u32 seq, u32 flags, struct sk_buff *skb,
                                 u8 cmd)
 {
@@ -705,8 +704,8 @@ static int ctrl_fill_mcgrp_info(struct genl_multicast_group *grp, u32 portid,
         if (hdr == NULL)
                 return -1;
 
-        if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, grp->family->name) ||
-            nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, grp->family->id))
+        if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||
+            nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id))
                 goto nla_put_failure;
 
         nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
@@ -783,7 +782,8 @@ static struct sk_buff *ctrl_build_family_msg(struct genl_family *family,
         return skb;
 }
 
-static struct sk_buff *ctrl_build_mcgrp_msg(struct genl_multicast_group *grp,
+static struct sk_buff *ctrl_build_mcgrp_msg(struct genl_family *family,
+                                            struct genl_multicast_group *grp,
                                             u32 portid, int seq, u8 cmd)
 {
         struct sk_buff *skb;
@@ -793,7 +793,7 @@ static struct sk_buff *ctrl_build_mcgrp_msg(struct genl_multicast_group *grp,
         if (skb == NULL)
                 return ERR_PTR(-ENOBUFS);
 
-        err = ctrl_fill_mcgrp_info(grp, portid, seq, 0, skb, cmd);
+        err = ctrl_fill_mcgrp_info(family, grp, portid, seq, 0, skb, cmd);
         if (err < 0) {
                 nlmsg_free(skb);
                 return ERR_PTR(err);
@@ -855,11 +855,10 @@ static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
         return genlmsg_reply(msg, info);
 }
 
-static int genl_ctrl_event(int event, void *data)
+static int genl_ctrl_event(int event, struct genl_family *family,
+                           struct genl_multicast_group *grp)
 {
         struct sk_buff *msg;
-        struct genl_family *family;
-        struct genl_multicast_group *grp;
 
         /* genl is still initialising */
         if (!init_net.genl_sock)
@@ -868,14 +867,13 @@ static int genl_ctrl_event(int event, void *data)
         switch (event) {
         case CTRL_CMD_NEWFAMILY:
         case CTRL_CMD_DELFAMILY:
-                family = data;
+                WARN_ON(grp);
                 msg = ctrl_build_family_msg(family, 0, 0, event);
                 break;
         case CTRL_CMD_NEWMCAST_GRP:
         case CTRL_CMD_DELMCAST_GRP:
-                grp = data;
-                family = grp->family;
-                msg = ctrl_build_mcgrp_msg(data, 0, 0, event);
+                BUG_ON(!grp);
+                msg = ctrl_build_mcgrp_msg(family, grp, 0, 0, event);
                 break;
         default:
                 return -EINVAL;