genetlink: use parsed attrs in dumppolicy

Attributes are already parsed based on the policy specified
in the family and ready-to-use in info->attrs. No need to
call genlmsg_parse() again.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index c3673d84d8b54c3c1cef52456afcc3ffd8d693db..6f7cd5f577b0b88cbe6378aa8204efb4a080440c 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1117,18 +1117,13 @@ struct ctrl_dump_policy_ctx {
 
 static int ctrl_dumppolicy_start(struct netlink_callback *cb)
 {
+       const struct genl_dumpit_info *info = genl_dumpit_info(cb);
        struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;
-       struct nlattr *tb[CTRL_ATTR_MAX + 1];
+       struct nlattr **tb = info->attrs;
        const struct genl_family *rt;
-       int err;
 
        BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 
-       err = genlmsg_parse(cb->nlh, &genl_ctrl, tb, genl_ctrl.maxattr,
-                           genl_ctrl.policy, cb->extack);
-       if (err)
-               return err;
-
        if (!tb[CTRL_ATTR_FAMILY_ID] && !tb[CTRL_ATTR_FAMILY_NAME])
                return -EINVAL;