netdev - Re: [PATCH net 1/6] tcp_metrics: fix addr

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Date: Wed, 2 Aug 2023 10:26:45 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <edumazet@...gle.com>
CC: <davem@...emloft.net>, <dsahern@...nel.org>, <eric.dumazet@...il.com>,
	<kuba@...nel.org>, <kuniyu@...zon.com>, <netdev@...r.kernel.org>,
	<pabeni@...hat.com>
Subject: Re: [PATCH net 1/6] tcp_metrics: fix addr_same() helper

From: Eric Dumazet <edumazet@...gle.com>
Date: Wed,  2 Aug 2023 13:14:55 +0000
> Because v4 and v6 families use separate inetpeer trees (respectively
> net->ipv4.peers and net->ipv6.peers), inetpeer_addr_cmp(a, b) assumes
> a & b share the same family.
> 
> tcp_metrics use a common hash table, where entries can have different
> families.
> 
> We must therefore make sure to not call inetpeer_addr_cmp()
> if the families do not match.
> 
> Fixes: d39d14ffa24c ("net: Add helper function to compare inetpeer addresses")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: David Ahern <dsahern@...nel.org>

Reviewed-by: Kuniyuki Iwashima <kuniyu@...zon.com>


> ---
>  net/ipv4/tcp_metrics.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
> index 82f4575f9cd90049a5ad4c7329ad1ddc28fc1aa0..c4daf0aa2d4d9695e128b67df571d91d647a254d 100644
> --- a/net/ipv4/tcp_metrics.c
> +++ b/net/ipv4/tcp_metrics.c
> @@ -78,7 +78,7 @@ static void tcp_metric_set(struct tcp_metrics_block *tm,
>  static bool addr_same(const struct inetpeer_addr *a,
>  		      const struct inetpeer_addr *b)
>  {
> -	return inetpeer_addr_cmp(a, b) == 0;
> +	return (a->family == b->family) && !inetpeer_addr_cmp(a, b);
>  }
>  
>  struct tcpm_hash_bucket {
> -- 
> 2.41.0.640.ga95def55d0-goog