From: Al Viro <viro@ZenIV•linux.org.uk>
To: netdev@vger•kernel.org
Cc: Jamal Hadi Salim <jhs@mojatatu•com>,
Cong Wang <xiyou.wangcong@gmail•com>,
Jiri Pirko <jiri@resnulli•us>
Subject: [PATCH 3/7] make sure that divisor is a power of 2
Date: Wed, 5 Sep 2018 20:04:10 +0100 [thread overview]
Message-ID: <20180905190414.5477-3-viro@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180905190414.5477-1-viro@ZenIV.linux.org.uk>
From: Al Viro <viro@zeniv•linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv•linux.org.uk>
---
net/sched/cls_u32.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 9ea5f2be907b..5816288810cc 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -995,7 +995,11 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
if (tb[TCA_U32_DIVISOR]) {
unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
- if (--divisor > 0x100) {
+ if (!is_power_of_2(divisor)) {
+ NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2");
+ return -EINVAL;
+ }
+ if (divisor-- > 0x100) {
NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
return -EINVAL;
}
--
2.11.0
next prev parent reply other threads:[~2018-09-05 23:35 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-05 19:01 [PATCHES] cls_u32 cleanups and fixes Al Viro
2018-09-05 19:04 ` [PATCH 1/7] fix hnode refcounting Al Viro
2018-09-05 19:04 ` [PATCH 2/7] mark root hnode explicitly Al Viro
2018-09-06 10:28 ` Jamal Hadi Salim
2018-09-06 10:34 ` Jamal Hadi Salim
2018-09-06 10:42 ` Jamal Hadi Salim
2018-09-06 10:59 ` Al Viro
2018-09-06 11:04 ` Jamal Hadi Salim
2018-09-07 2:57 ` Cong Wang
2018-09-07 3:04 ` Al Viro
2018-09-07 3:23 ` Cong Wang
2018-09-07 3:49 ` Al Viro
2018-09-07 4:14 ` Cong Wang
2018-09-05 19:04 ` Al Viro [this message]
2018-09-06 10:28 ` [PATCH 3/7] make sure that divisor is a power of 2 Jamal Hadi Salim
2018-09-05 19:04 ` [PATCH 4/7] get rid of unused argument of u32_destroy_key() Al Viro
2018-09-06 10:34 ` Jamal Hadi Salim
2018-09-05 19:04 ` [PATCH 5/7] get rid of tc_u_knode ->tp Al Viro
2018-09-06 10:35 ` Jamal Hadi Salim
2018-09-05 19:04 ` [PATCH 6/7] get rid of tc_u_common ->rcu Al Viro
2018-09-06 10:36 ` Jamal Hadi Salim
2018-09-07 4:18 ` Cong Wang
2018-09-07 4:28 ` Al Viro
2018-09-05 19:04 ` [PATCH 7/7] clean tc_u_common hashtable Al Viro
2018-09-06 10:36 ` Jamal Hadi Salim
2018-09-06 10:21 ` [PATCH 1/7] fix hnode refcounting Jamal Hadi Salim
2018-09-07 2:35 ` Al Viro
2018-09-07 12:13 ` Jamal Hadi Salim
2018-09-07 12:33 ` Jamal Hadi Salim
2018-09-08 15:03 ` Al Viro
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