netdev - Re: [PATCH net-next] tcp: fix signed/unsigned comparison

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Date:   Sun, 17 Apr 2022 20:24:20 +0200
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH net-next] tcp: fix signed/unsigned comparison

On Apr 17 2022, Eric Dumazet wrote:

> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index cf2dc19bb8c766c1d33406053fd61c0873f15489..0d88984e071531fb727bdee178b0c01fd087fe5f 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -5959,7 +5959,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
>  
>  step5:
>  	reason = tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT);
> -	if (reason < 0)
> +	if ((int)reason < 0)
>  		goto discard;
>  
>  	tcp_rcv_rtt_measure_ts(sk, skb);

Shouldn't reason be negated before passing it to tcp_drop_reason?

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."