netfilter: ebt_among: obtain match size through different means

The function signatures will be changed to match those of Xtables, and
the datalen argument will be gone. ebt_among unfortunately relies on
it, so we need to obtain it somehow.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/bridge/netfilter/ebt_among.c b/net/bridge/netfilter/ebt_among.c
index 568c890887b..88b5c9118a7 100644
--- a/net/bridge/netfilter/ebt_among.c
+++ b/net/bridge/netfilter/ebt_among.c
@@ -178,6 +178,8 @@ ebt_among_check(const char *tablename, unsigned int hookmask,
                 const struct ebt_entry *e, void *data,
                 unsigned int datalen)
 {
+        const struct ebt_entry_match *em =
+                container_of(data, const struct ebt_entry_match, data);
         const struct ebt_among_info *info = data;
         int expected_length = sizeof(struct ebt_among_info);
         const struct ebt_mac_wormhash *wh_dst, *wh_src;
@@ -188,11 +190,11 @@ ebt_among_check(const char *tablename, unsigned int hookmask,
         expected_length += ebt_mac_wormhash_size(wh_dst);
         expected_length += ebt_mac_wormhash_size(wh_src);
 
-        if (datalen != EBT_ALIGN(expected_length)) {
+        if (em->match_size != EBT_ALIGN(expected_length)) {
                 printk(KERN_WARNING
                        "ebtables: among: wrong size: %d "
                        "against expected %d, rounded to %Zd\n",
-                       datalen, expected_length,
+                       em->match_size, expected_length,
                        EBT_ALIGN(expected_length));
                 return false;
         }