From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 511A428ED for ; Mon, 12 Dec 2022 13:56:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8BFF5C433EF; Mon, 12 Dec 2022 13:56:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670853365; bh=aPLxUTXdo/xecYuHkuSOuheoc+cRFJ2fpNAMlMypgHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x2c+AhEGfw9IFpgjp72ahQ5GZRE8aLzDcZunVcrZQpTFyKKgox8TgZlher/z/zu7+ HE5kWukYj3vCCKXPpBjua3P8DBsGQDqAd+PV887vJH4RK5cBhsWAsKtca7TKryXFWI z7upCV+RDT+qnZIIXvY5P+pVsHr3HJ29C9Kz4xmk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiongfeng Wang , Bartosz Golaszewski , Sasha Levin Subject: [PATCH 4.9 16/31] gpio: amd8111: Fix PCI device reference count leak Date: Mon, 12 Dec 2022 14:19:34 +0100 Message-Id: <20221212130910.868473540@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221212130909.943483205@linuxfoundation.org> References: <20221212130909.943483205@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Xiongfeng Wang [ Upstream commit 45fecdb9f658d9c82960c98240bc0770ade19aca ] for_each_pci_dev() is implemented by pci_get_device(). The comment of pci_get_device() says that it will increase the reference count for the returned pci_dev and also decrease the reference count for the input pci_dev @from if it is not NULL. If we break for_each_pci_dev() loop with pdev not NULL, we need to call pci_dev_put() to decrease the reference count. Add the missing pci_dev_put() after the 'out' label. Since pci_dev_put() can handle NULL input parameter, there is no problem for the 'Device not found' branch. For the normal path, add pci_dev_put() in amd_gpio_exit(). Fixes: f942a7de047d ("gpio: add a driver for GPIO pins found on AMD-8111 south bridge chips") Signed-off-by: Xiongfeng Wang Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin --- drivers/gpio/gpio-amd8111.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpio/gpio-amd8111.c b/drivers/gpio/gpio-amd8111.c index 30ad7d7c1678..f8486bac12d0 100644 --- a/drivers/gpio/gpio-amd8111.c +++ b/drivers/gpio/gpio-amd8111.c @@ -231,7 +231,10 @@ static int __init amd_gpio_init(void) ioport_unmap(gp.pm); goto out; } + return 0; + out: + pci_dev_put(pdev); return err; } @@ -239,6 +242,7 @@ static void __exit amd_gpio_exit(void) { gpiochip_remove(&gp.chip); ioport_unmap(gp.pm); + pci_dev_put(gp.pdev); } module_init(amd_gpio_init); -- 2.35.1