From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8FC71225C3 for ; Tue, 10 Oct 2023 18:18:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="BhKjGvsQ" Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B874B4 for ; Tue, 10 Oct 2023 11:18:25 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-690ce3c55f1so4489003b3a.0 for ; Tue, 10 Oct 2023 11:18:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1696961905; x=1697566705; darn=vger.kernel.org; h=in-reply-to:autocrypt:from:references:cc:to:subject:user-agent :mime-version:date:message-id:from:to:cc:subject:date:message-id :reply-to; bh=BMRMG29NBoh2iseelfO8n+Va9iA5Kf8a2oWt4eTw29c=; b=BhKjGvsQuXFFXepdqIr+NBIWlP/b+PrnX8p/B55cEYB0tu7BHITHzTpe/9iORGxKPu 82KDF5RuX8oi0nZGBPDKIyf2Ts4iQvpCQLdX7ilTXNHexO9CSuv4DsOfxXoS0drId7Pp ab2hoveNdECG1RU/Q3LrlyBxHOsBrAbnCSw4M= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696961905; x=1697566705; h=in-reply-to:autocrypt:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=BMRMG29NBoh2iseelfO8n+Va9iA5Kf8a2oWt4eTw29c=; b=j4IHG0zsRAJEHuhJN2KKAeX2RsmTsNIl53qOHxo718qhgWxnsKMc8st872Ofi1rYxT lkwgdwJXTHrXZnPh4kSCTyQGj5sZPNmjL1qCdDFKjZvCaURvKA955Kv+8UqzQzL/3PRR ZR+lAoQvBsGLUJx6hyOJ6ii+CVs6uf7EFzZ9R2epyqmVXAQYCFrtjL0Ezf1fbA765ZaT fXBDl3Y0OPAV/5xizESFO2+zZTo0Vox7ri7zKIjwss+bIpmld32XtD0FmxOla+7aeJ3o MoGW+Y1eTHYM2VWqVRhFLhioEqq80iaZlWToRleEQpSf2Xz4FLF2hyMmkzmQgwYN2HMP 86eg== X-Gm-Message-State: AOJu0Yzrux81qeRmk7skiP5QHD7JjaAclBgTow4YL7qiajWxe5RXdXMF 5R599PPuugkr9kEjMxucuK3jdQ== X-Google-Smtp-Source: AGHT+IFzplog2Wg5DDNRxX2BsWkPQId+u+ONGicAfqTETok+bEm3RY6XeykmltHQgfRjs2kyy5a7Cg== X-Received: by 2002:a05:6a00:14d4:b0:68e:3fe6:2c82 with SMTP id w20-20020a056a0014d400b0068e3fe62c82mr19108235pfu.34.1696961904852; Tue, 10 Oct 2023 11:18:24 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id a19-20020aa78653000000b0068fb8080939sm8519609pfo.65.2023.10.10.11.18.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Oct 2023 11:18:24 -0700 (PDT) Message-ID: Date: Tue, 10 Oct 2023 11:18:22 -0700 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] net: dsa: bcm_sf2: Fix possible memory leak in bcm_sf2_mdio_register() To: Simon Horman , Jinjie Ruan Cc: netdev@vger.kernel.org, Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vivien Didelot References: <20231009083906.1212900-1-ruanjinjie@huawei.com> <20231010180522.GB1003866@kernel.org> From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAyxcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFrZXktdXNhZ2UtbWFz a0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2RpbmdAcGdwLmNvbXBn cG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29tLmNvbQUbAwAAAAMW AgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagBQJk1oG9BQkj4mj6AAoJEIEx tcQpvGag13gH/2VKD6nojbJ9TBHLl+lFPIlOBZJ7UeNN8Cqhi9eOuH97r4Qw6pCnUOeoMlBH C6Dx8AcEU+OH4ToJ9LoaKIByWtK8nShayHqDc/vVoLasTwvivMAkdhhq6EpjG3WxDfOn8s5b Z/omGt/D/O8tg1gWqUziaBCX+JNvrV3aHVfbDKjk7KRfvhj74WMadtH1EOoVef0eB7Osb0GH 1nbrPZncuC4nqzuayPf0zbzDuV1HpCIiH692Rki4wo/72z7mMJPM9bNsUw1FTM4ALWlhdVgT gvolQPmfBPttY44KRBhR3Ipt8r/dMOlshaIW730PU9uoTkORrfGxreOUD3XT4g8omuvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: <20231010180522.GB1003866@kernel.org> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000008ef47f060760bb9b" X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_NONE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net --0000000000008ef47f060760bb9b Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/10/23 11:05, Simon Horman wrote: > On Mon, Oct 09, 2023 at 04:39:06PM +0800, Jinjie Ruan wrote: >> In bcm_sf2_mdio_register(), the class_find_device() will call get_device() >> to increment reference count for priv->master_mii_bus->dev if >> of_mdio_find_bus() succeeds. If mdiobus_alloc() or mdiobus_register() >> fails, it will call get_device() twice without decrement reference count >> for the device. And it is the same if bcm_sf2_mdio_register() succeeds but >> fails in bcm_sf2_sw_probe(), or if bcm_sf2_sw_probe() succeeds. If the >> reference count has not decremented to zero, the dev related resource will >> not be freed. >> >> So remove the get_device() in bcm_sf2_mdio_register(), and call >> put_device() if mdiobus_alloc() or mdiobus_register() fails and in >> bcm_sf2_mdio_unregister() to solve the issue. >> >> Fixes: 461cd1b03e32 ("net: dsa: bcm_sf2: Register our slave MDIO bus") >> Signed-off-by: Jinjie Ruan > > Hi Jinjie Ruan, > > I agree with your analysis here, but I wonder if it would be nicer > to move bcm_sf2_mdio_register() to a more idiomatic way of unwinding > from errors. That would appear a tad cleaner, yes! > > Something like this (compile tested only!) > > diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c > index 0b62bd78ac50..037ce118ee00 100644 > --- a/drivers/net/dsa/bcm_sf2.c > +++ b/drivers/net/dsa/bcm_sf2.c > @@ -617,8 +617,8 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds) > dn = of_find_compatible_node(NULL, NULL, "brcm,unimac-mdio"); > priv->master_mii_bus = of_mdio_find_bus(dn); > if (!priv->master_mii_bus) { > - of_node_put(dn); > - return -EPROBE_DEFER; > + err = -EPROBE_DEFER; > + goto err_of_node_put; > } > > get_device(&priv->master_mii_bus->dev); > @@ -626,8 +626,8 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds) > > priv->slave_mii_bus = mdiobus_alloc(); > if (!priv->slave_mii_bus) { > - of_node_put(dn); > - return -ENOMEM; > + err = -ENOMEM; > + goto err_put_master_mii_bus_device; > } > > priv->slave_mii_bus->priv = priv; > @@ -684,12 +684,18 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds) > } > > err = mdiobus_register(priv->slave_mii_bus); > - if (err && dn) { > - mdiobus_free(priv->slave_mii_bus); > - of_node_put(dn); > - } > + if (err && dn) > + goto err_free_slave_mii_bus; > > return err; > + > +err_free_slave_mii_bus: > + mdiobus_free(priv->slave_mii_bus); > +err_put_master_mii_bus_device: > + put_device(&priv->master_mii_bus->dev); > +err_of_node_put: > + of_node_put(dn); > + return err; > } > > static void bcm_sf2_mdio_unregister(struct bcm_sf2_priv *priv) -- Florian --0000000000008ef47f060760bb9b Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQeQYJKoZIhvcNAQcCoIIQajCCEGYCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3QMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE 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