[PATCH] ebtables: don't compute gap before checking struct type

We cannot compute the gap until we know we have a 'struct ebt_entry'
and not 'struct ebt_entries'.  Failure to check can cause crash.
Tested-by: Santiago Garcia Mantinan <manty@manty.net>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

net/bridge/netfilter/ebtables.c

@@ -575,7 +575,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
 	struct ebt_entry_target *t;
 	struct ebt_target *target;
 	unsigned int i, j, hook = 0, hookmask = 0;
-	size_t gap = e->next_offset - e->target_offset;
+	size_t gap;
 	int ret;
 
 	/* don't mess with the struct ebt_entries */
@@ -625,6 +625,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
 	if (ret != 0)
 		goto cleanup_watchers;
 	t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
+	gap = e->next_offset - e->target_offset;
 	target = find_target_lock(t->u.name, &ret, &ebt_mutex);
 	if (!target)
 		goto cleanup_watchers;