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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2017-11-01 16:32:15 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-02 16:16:27 +0900
commit4eebff27ca4182bbf5f039dd60d79e2d7c0a707e (patch)
tree4e4eb972c1a18167c2d5d0e394fb033f4b20b4db /net/ipv4/tcp_nv.c
parent3a99df9a3d14cd866b5516f8cba515a3bfd554ab (diff)
downloadlinux-4eebff27ca4182bbf5f039dd60d79e2d7c0a707e.tar.bz2
tcp_nv: fix division by zero in tcpnv_acked()
Average RTT could become zero. This happened in real life at least twice. This patch treats zero as 1us. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by: Lawrence Brakmo <Brakmo@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_nv.c')
-rw-r--r--net/ipv4/tcp_nv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_nv.c b/net/ipv4/tcp_nv.c
index 1ff73982e28c..125fc1450b01 100644
--- a/net/ipv4/tcp_nv.c
+++ b/net/ipv4/tcp_nv.c
@@ -252,7 +252,7 @@ static void tcpnv_acked(struct sock *sk, const struct ack_sample *sample)
/* rate in 100's bits per second */
rate64 = ((u64)sample->in_flight) * 8000000;
- rate = (u32)div64_u64(rate64, (u64)(avg_rtt * 100));
+ rate = (u32)div64_u64(rate64, (u64)(avg_rtt ?: 1) * 100);
/* Remember the maximum rate seen during this RTT
* Note: It may be more than one RTT. This function should be