[PATCH net 1/6] tcp_metrics: fix addr_same() helper

From: Eric Dumazet <edumazet@google.com>
To: "David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	 Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org, eric.dumazet@gmail.com,
	 David Ahern <dsahern@kernel.org>,
	Kuniyuki Iwashima <kuniyu@amazon.com>,
	 Eric Dumazet <edumazet@google.com>
Subject: [PATCH net 1/6] tcp_metrics: fix addr_same() helper
Date: Wed,  2 Aug 2023 13:14:55 +0000	[thread overview]
Message-ID: <20230802131500.1478140-2-edumazet@google.com> (raw)
In-Reply-To: <20230802131500.1478140-1-edumazet@google.com>

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@google.com>
Cc: David Ahern <dsahern@kernel.org>
---
 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

