diff mbox series

[3/7] make sure that divisor is a power of 2

Message ID 20180905190414.5477-3-viro@ZenIV.linux.org.uk
State Changes Requested, archived
Delegated to: David Miller
Headers show
Series [1/7] fix hnode refcounting | expand

Commit Message

Al Viro Sept. 5, 2018, 7:04 p.m. UTC 
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(-)

Comments

Jamal Hadi Salim Sept. 6, 2018, 10:28 a.m. UTC | #1 
On 2018-09-05 3:04 p.m., Al Viro wrote:
> From: Al Viro <viro@zeniv.linux.org.uk>
> 
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>


cheers,
jamal
diff mbox series

Patch

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;
 		}