[NETFILTER]: xt_hashlimit/xt_string: missing string validation

The hashlimit table name and the textsearch algorithm need to be
terminated, the textsearch pattern length must not exceed the
maximum size.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/ipt_hashlimit.c b/net/ipv4/netfilter/ipt_hashlimit.c
index 92980ab8ce48..6b662449e825 100644
--- a/net/ipv4/netfilter/ipt_hashlimit.c
+++ b/net/ipv4/netfilter/ipt_hashlimit.c
@@ -508,6 +508,9 @@ hashlimit_checkentry(const char *tablename,
         if (!r->cfg.expire)
                 return 0;
 
+        if (r->name[sizeof(r->name) - 1] != '\0')
+                return 0;
+
         /* This is the best we've got: We cannot release and re-grab lock,
          * since checkentry() is called before ip_tables.c grabs ipt_mutex.  
          * We also cannot grab the hashtable spinlock, since htable_create will