[NETFILTER 2.6.18 3/3]: hashlimit match: fix random initialization

[Patrick McHardy]

[NETFILTER]: hashlimit match: fix random initialization

hashlimit does:

        if (!ht->rnd)
                get_random_bytes(&ht->rnd, 4);

ignoring that 0 is also a valid random number.

Signed-off-by: Patrick McHardy <kaber at trash.net>

---
commit f42a39846047e78d30c913270125bed2e0c5a0da
tree a875d2fb478ecaa405810a020ee4af61fa5c42f1
parent b010cc3184ce7cb65a9865ae52ec2ce6f3fe4c9d
author Patrick McHardy <kaber at trash.net> Thu, 01 Jun 2006 20:43:40 +0200
committer Patrick McHardy <kaber at trash.net> Thu, 01 Jun 2006 20:43:40 +0200

 net/ipv4/netfilter/ipt_hashlimit.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/netfilter/ipt_hashlimit.c b/net/ipv4/netfilter/ipt_hashlimit.c
index 85edfb7..92980ab 100644
--- a/net/ipv4/netfilter/ipt_hashlimit.c
+++ b/net/ipv4/netfilter/ipt_hashlimit.c
@@ -80,6 +80,7 @@ struct ipt_hashlimit_htable {
 	/* used internally */
 	spinlock_t lock;		/* lock for list_head */
 	u_int32_t rnd;			/* random seed for hash */
+	int rnd_initialized;
 	struct timer_list timer;	/* timer for gc */
 	atomic_t count;			/* number entries in table */
 
@@ -134,8 +135,10 @@ __dsthash_alloc_init(struct ipt_hashlimi
 
 	/* initialize hash with random val at the time we allocate
 	 * the first hashtable entry */
-	if (!ht->rnd)
+	if (!ht->rnd_initialized) {
 		get_random_bytes(&ht->rnd, 4);
+		ht->rnd_initialized = 1;
+	}
 
 	if (ht->cfg.max &&
 	    atomic_read(&ht->count) >= ht->cfg.max) {
@@ -214,7 +217,7 @@ static int htable_create(struct ipt_hash
 
 	atomic_set(&hinfo->count, 0);
 	atomic_set(&hinfo->use, 1);
-	hinfo->rnd = 0;
+	hinfo->rnd_initialized = 0;
 	spin_lock_init(&hinfo->lock);
 	hinfo->pde = create_proc_entry(minfo->name, 0, hashlimit_procdir);
 	if (!hinfo->pde) {