netfilter: xt_hashlimit: use _ALL macro to reject unknown flag bits

David Miller says:
     The canonical way to validate if the set bits are in a valid
     range is to have a "_ALL" macro, and test:
     if (val & ~XT_HASHLIMIT_ALL)
         goto err;"

make it so.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 5d5af1d04fa2..26a668a84aa2 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -647,7 +647,7 @@ static int hashlimit_mt_check(const struct xt_mtchk_param *par)
                         return -EINVAL;
         }
 
-        if (info->cfg.mode >= XT_HASHLIMIT_MAX) {
+        if (info->cfg.mode & ~XT_HASHLIMIT_ALL) {
                 pr_info("Unknown mode mask %X, kernel too old?\n",
                                                 info->cfg.mode);
                 return -EINVAL;