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TCP: tcp_hybla: Fix integer overflow in slow start increment

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For large values of rtt, 2^rho operation may overflow u32. Clamp down the increment to 2^16.

Signed-off-by: Daniele Lacamera <root@danielinux.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniele Lacamera 2010-06-02 02:02:04 +00:00 committed by David S. Miller
parent 33c29dde7d
commit edafe50240
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp_hybla.c
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@ -126,8 +126,8 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
* calculate 2^fract in a <<7 value.
*/
is_slowstart = 1;
increment = ((1 << ca->rho) * hybla_fraction(rho_fractions))
- 128;
increment = ((1 << min(ca->rho, 16U)) *
hybla_fraction(rho_fractions)) - 128;
} else {
/*
* congestion avoidance