netdev - [PATCH net-next] rhashtable: Warn if min_size or max

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:	Thu, 19 Mar 2015 17:34:39 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, herbert@...dor.apana.org.au
Subject: [PATCH net-next] rhashtable: Warn if min_size or max_size are not a power of two

The current code correctly limits table size to the next power of two.
This check is solely to catch programming errors.

Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
 lib/rhashtable.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 5f8fe3e..ad218d6 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -933,6 +933,11 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
 	if (params->nulls_base && params->nulls_base < (1U << RHT_BASE_SHIFT))
 		return -EINVAL;
 
+	WARN_ON(params->min_size &&
+		roundup_pow_of_two(params->min_size) != params->min_size);
+	WARN_ON(params->max_size &&
+		roundup_pow_of_two(params->max_size) != params->max_size);
+
 	params->min_size = max(params->min_size, HASH_MIN_SIZE);
 
 	if (params->nelem_hint)
-- 
1.9.3

--
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