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(bb116-15-8-251.singnet.com.sg. [116.15.8.251]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2cad789e7ebsm32921335ad.81.2026.07.05.04.36.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Jul 2026 04:36:37 -0700 (PDT) From: James Raphael Tiovalen To: Sabrina Dubroca , netdev@vger.kernel.org Cc: James Raphael Tiovalen , stable@vger.kernel.org, Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Antoine Tenart , linux-kernel@vger.kernel.org Subject: [PATCH net] macsec: fix promiscuity refcount leak in macsec_dev_open() Date: Sun, 5 Jul 2026 19:36:29 +0800 Message-ID: <20260705113629.187490-1-jamestiotio@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When a MACsec interface with IFF_PROMISC set is brought up on top of a device that has hardware offload enabled, macsec_dev_open() first calls dev_set_promiscuity(real_dev, 1) and then propagates the open to the offload device. If that propagation fails, the error path jumps to the clear_allmulti label, which only reverts allmulti and the unicast address. The promiscuity taken on the lower device is never dropped, so real_dev is left permanently stuck in promiscuous mode. Its promiscuity count can no longer be balanced from software. Add a clear_promisc label that drops the promiscuity reference and route the two offload failure paths to it. The dev_set_promiscuity() failure itself still jumps to clear_allmulti, since on that failure the count was not incremented. Fixes: 3cf3227a21d1 ("net: macsec: hardware offloading infrastructure") Cc: stable@vger.kernel.org Signed-off-by: James Raphael Tiovalen --- drivers/net/macsec.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index fb009120a924..71e4676b1dd9 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -3615,19 +3615,22 @@ static int macsec_dev_open(struct net_device *dev) ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { err = -EOPNOTSUPP; - goto clear_allmulti; + goto clear_promisc; } ctx.secy = &macsec->secy; err = macsec_offload(ops->mdo_dev_open, &ctx); if (err) - goto clear_allmulti; + goto clear_promisc; } if (netif_carrier_ok(real_dev)) netif_carrier_on(dev); return 0; +clear_promisc: + if (dev->flags & IFF_PROMISC) + dev_set_promiscuity(real_dev, -1); clear_allmulti: if (dev->flags & IFF_ALLMULTI) dev_set_allmulti(real_dev, -1); -- 2.43.0