From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pan Bian , "David S. Miller" , Sasha Levin Subject: [PATCH 4.14 63/89] net: hisilicon: remove unexpected free_netdev Date: Fri, 14 Dec 2018 13:00:16 +0100 Message-Id: <20181214115732.780047666@linuxfoundation.org> In-Reply-To: <20181214115729.658859279@linuxfoundation.org> References: <20181214115729.658859279@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit c758940158bf29fe14e9d0f89d5848f227b48134 ] The net device ndev is freed via free_netdev when failing to register the device. The control flow then jumps to the error handling code block. ndev is used and freed again. Resulting in a use-after-free bug. Signed-off-by: Pan Bian Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/hisilicon/hip04_eth.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hip04_eth.c b/drivers/net/ethernet/hisilicon/hip04_eth.c index 0cec06bec63e..c27054b8ce81 100644 --- a/drivers/net/ethernet/hisilicon/hip04_eth.c +++ b/drivers/net/ethernet/hisilicon/hip04_eth.c @@ -914,10 +914,8 @@ static int hip04_mac_probe(struct platform_device *pdev) } ret = register_netdev(ndev); - if (ret) { - free_netdev(ndev); + if (ret) goto alloc_fail; - } return 0; -- 2.19.1