From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Pravin B Shelar <pshelar@ovn.org>,
"David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org, dev@openvswitch.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <garsilva@embeddedor.com>
Subject: [PATCH] openvswitch: meter: Use 64-bit arithmetic instead of 32-bit
Date: Tue, 30 Jan 2018 22:55:33 -0600 [thread overview]
Message-ID: <20180131045533.GA15485@embeddedgus> (raw)
Add suffix LL to constant 1000 in order to give the compiler
complete information about the proper arithmetic to use. Notice
that this constant is used in a context that expects an expression
of type long long int (64 bits, signed).
The expression (band->burst_size + band->rate) * 1000 is currently
being evaluated using 32-bit arithmetic.
Addresses-Coverity-ID: 1461563 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
net/openvswitch/meter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index 3fbfc78..04b9428 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -488,7 +488,7 @@ bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb,
long long int max_bucket_size;
band = &meter->bands[i];
- max_bucket_size = (band->burst_size + band->rate) * 1000;
+ max_bucket_size = (band->burst_size + band->rate) * 1000LL;
band->bucket += delta_ms * band->rate;
if (band->bucket > max_bucket_size)
--
2.7.4
next reply other threads:[~2018-01-31 4:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-31 4:55 Gustavo A. R. Silva [this message]
2018-01-31 15:33 ` [PATCH] openvswitch: meter: Use 64-bit arithmetic instead of 32-bit David Miller
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