Bluetooth: Host: Fix SMP Pairing failed code on invalid Public Key

sjanc · dkalowsk · commit 9b27a472f42e · 2025-06-13T10:21:42.000-07:00
Core Specification 6.1 clarified exptected erro code in case peer
sending invalid Public Key. In case pairing is aborted during or
immediately after Public Key Exchange phase has completed (which is
the case here) expected reason code is set to "DHKey Check Failed".

This was affecting SM/CEN/KDU/BI-04-C and SM/PER/KDU/BI-04-C
qualification test cases.

Signed-off-by: Szymon Janc &lt;szymon.janc@codecoup.pl&gt;
diff --git a/subsys/bluetooth/host/smp.c b/subsys/bluetooth/host/smp.c
@@ -4491,7 +4491,7 @@ static uint8_t smp_public_key(struct bt_smp *smp, struct net_buf *buf)
 		}
 	} else if (!bt_pub_key_is_valid(smp->pkey)) {
 		LOG_WRN("Received invalid public key");
-		return BT_SMP_ERR_INVALID_PARAMS;
+		return BT_SMP_ERR_DHKEY_CHECK_FAILED;
 	}
 
 	if (IS_ENABLED(CONFIG_BT_CENTRAL) &&

Original file line number	Diff line number	Diff line change
`@@ -4491,7 +4491,7 @@ static uint8_t smp_public_key(struct bt_smp smp, struct net_buf buf)`
`4491`	`4491`	`}`
`4492`	`4492`	`} else if (!bt_pub_key_is_valid(smp->pkey)) {`
`4493`	`4493`	`LOG_WRN("Received invalid public key");`
`4494`		`- return BT_SMP_ERR_INVALID_PARAMS;`
	`4494`	`+ return BT_SMP_ERR_DHKEY_CHECK_FAILED;`
`4495`	`4495`	`}`
`4496`	`4496`
`4497`	`4497`	`if (IS_ENABLED(CONFIG_BT_CENTRAL) &&`