netfilter: nft_compat: fix hook validation for non-base chains

Set hook_mask to zero for non-base chains, otherwise people may hit
bogus errors from the xt_check_target() and xt_check_match() when
validating the uninitialized hook_mask.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index 7e2683c8a44a..44ae273b4391 100644
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -95,6 +95,8 @@ nft_target_set_tgchk_param(struct xt_tgchk_param *par,
                 const struct nf_hook_ops *ops = &basechain->ops[0];
 
                 par->hook_mask = 1 << ops->hooknum;
+        } else {
+                par->hook_mask = 0;
         }
         par->family     = ctx->afi->family;
 }
@@ -293,6 +295,8 @@ nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
                 const struct nf_hook_ops *ops = &basechain->ops[0];
 
                 par->hook_mask = 1 << ops->hooknum;
+        } else {
+                par->hook_mask = 0;
         }
         par->family     = ctx->afi->family;
 }