From nobody Sun Dec 14 13:45:40 2025 Received: from cstnet.cn (smtp81.cstnet.cn [159.226.251.81]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10B41219E0; Mon, 7 Apr 2025 07:58:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744012730; cv=none; b=SNXWkHWt6C568GmmO8b92P2F7CIaQ36Nds2sCLq5xxppj5A/CuZwSRGOcw5M1dIVr4D7hrrv1v/pyuTTiv1giTumQRnbEmYMFpjPwq7ugz/Rs62fuiWrHIj/BdA7dvI7FkrZNHM7I8PV49yZZesUqFNV7E3KUSVKZN5xnfCfzjY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744012730; c=relaxed/simple; bh=8xOjutctvz7dst4tkZ4ofSTIOfEjqCOXV1LpbhwVBUY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=HUWBFoV6/E7udqIFIxrncAk8slTPwAiwp/zZmpqwwu5rPl/gScloCaK6TGgMkLpAyIyPSViOkqX0F0LsQuhNKbDq19bnQHbGCM4Ofw85EDXViWhYCgEuOkJSaOsutcHeKg75g4Az8YDQfsRdnubLX3WjjbjyplvfNaqlo3yLldM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from icess-ProLiant-DL380-Gen10.. (unknown [183.174.60.14]) by APP-03 (Coremail) with SMTP id rQCowAC3Y0CphfNnN1jWBg--.33395S2; Mon, 07 Apr 2025 15:58:39 +0800 (CST) From: Ma Ke To: linux@armlinux.org.uk, elder@kernel.org, sumit.garg@kernel.org, make24@iscas.ac.cn, gregkh@linuxfoundation.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v5 RESEND] [ARM] fix reference leak in locomo_init_one_child() Date: Mon, 7 Apr 2025 15:58:32 +0800 Message-Id: <20250407075832.2592519-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: rQCowAC3Y0CphfNnN1jWBg--.33395S2 X-Coremail-Antispam: 1UD129KBjvJXoW7WryrKw13CF4fuFW7AryDGFg_yoW8Wry7pa s7Cas8trWUWr4vgFW0qFn7ZFyUGayIkw45GrW8C340g3s0vrWIqFy0ga429w1UXrWkAFnY vF4xXw4UG3WUCaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvK14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAac4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC 0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr 1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IE rcIFxwCY1x0262kKe7AKxVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbV WUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF 67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42 IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF 0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxh VjvjDU0xZFpf9x0JUvg4fUUUUU= X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ Content-Type: text/plain; charset="utf-8" Once device_register() failed, we should call put_device() to decrement reference count for cleanup. Or it could cause memory leak. As comment of device_register() says, 'NOTE: _Never_ directly free @dev after calling this function, even if it returned an error! Always use put_device() to give up the reference initialized in this function instead.' Found by code review. Cc: stable@vger.kernel.org Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Ma Ke --- Changes in v5: - modified the bug description as suggestions; Changes in v4: - deleted the redundant initialization; Changes in v3: - modified the patch as suggestions; Changes in v2: - modified the patch as suggestions. --- arch/arm/common/locomo.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c index cb6ef449b987..45106066a17f 100644 --- a/arch/arm/common/locomo.c +++ b/arch/arm/common/locomo.c @@ -223,10 +223,8 @@ locomo_init_one_child(struct locomo *lchip, struct loc= omo_dev_info *info) int ret; =20 dev =3D kzalloc(sizeof(struct locomo_dev), GFP_KERNEL); - if (!dev) { - ret =3D -ENOMEM; - goto out; - } + if (!dev) + return -ENOMEM; =20 /* * If the parent device has a DMA mask associated with it, @@ -254,10 +252,9 @@ locomo_init_one_child(struct locomo *lchip, struct loc= omo_dev_info *info) NO_IRQ : lchip->irq_base + info->irq[0]; =20 ret =3D device_register(&dev->dev); - if (ret) { - out: - kfree(dev); - } + if (ret) + put_device(&dev->dev); + return ret; } =20 --=20 2.25.1