netdev - [PATCH] ipv4: Fix nexthop exception hash computation.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 17 Jul 2012 13:23:50 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH] ipv4: Fix nexthop exception hash computation.


Need to mask it with (FNHE_HASH_SIZE - 1).

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/ipv4/route.c |   16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a5bd0b4..812e444 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1347,6 +1347,16 @@ static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash, __be3
 	return oldest;
 }
 
+static inline u32 fnhe_hashfun(__be32 daddr)
+{
+	u32 hval;
+
+	hval = (__force u32) daddr;
+	hval ^= (hval >> 11) ^ (hval >> 22);
+
+	return hval & (FNHE_HASH_SIZE - 1);
+}
+
 static struct fib_nh_exception *find_or_create_fnhe(struct fib_nh *nh, __be32 daddr)
 {
 	struct fnhe_hash_bucket *hash = nh->nh_exceptions;
@@ -1361,8 +1371,7 @@ static struct fib_nh_exception *find_or_create_fnhe(struct fib_nh *nh, __be32 da
 			return NULL;
 	}
 
-	hval = (__force u32) daddr;
-	hval ^= (hval >> 11) ^ (hval >> 22);
+	hval = fnhe_hashfun(daddr);
 	hash += hval;
 
 	depth = 0;
@@ -1890,8 +1899,7 @@ static void rt_bind_exception(struct rtable *rt, struct fib_nh *nh, __be32 daddr
 	struct fib_nh_exception *fnhe;
 	u32 hval;
 
-	hval = (__force u32) daddr;
-	hval ^= (hval >> 11) ^ (hval >> 22);
+	hval = fnhe_hashfun(daddr);
 
 	for (fnhe = rcu_dereference(hash[hval].chain); fnhe;
 	     fnhe = rcu_dereference(fnhe->fnhe_next)) {
-- 
1.7.10.4


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html