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Date:   Wed, 17 Apr 2019 13:58:08 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH] ipv4: set the tcp_min_rtt_wlen range from 0 to one day

From: ZhangXiaoxu <>
Date: Tue, 16 Apr 2019 09:47:24 +0800

> There is a UBSAN report as below:
> UBSAN: Undefined behaviour in net/ipv4/tcp_input.c:2877:56
> signed integer overflow:
> It can be reproduced by:
>   echo 2147483647 > /proc/sys/net/ipv4/tcp_min_rtt_wlen
> Fixes: f672258391b42 ("tcp: track min RTT using windowed min-filter")
> Signed-off-by: ZhangXiaoxu <>

Applied and queued up for -stable.

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