From e962610f8100e1b52973f5a9c855cbc3d1ba04ec Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Thu, 13 Sep 2012 10:33:28 +0800 Subject: [PATCH] wireless: ath9k-htc: fix possible use after free Inside ath9k_hif_usb_firmware_fail(), the instance of 'struct struct hif_device_usb' may be freed by ath9k_hif_usb_disconnect() after complete(&hif_dev->fw_done); But 'hif_dev' is still accessed after the line code above is executed. This patch fixes the issue by not accessing 'hif_dev' after 'complete(&hif_dev->fw_done)' inside ath9k_hif_usb_firmware_fail(). Cc: ath9k-devel@lists.ath9k.org Cc: "Luis R. Rodriguez" Cc: Jouni Malinen Cc: Vasanthakumar Thiagarajan Cc: Senthil Balasubramanian Cc: "John W. Linville" Signed-off-by: Ming Lei Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/hif_usb.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c index ee6e50aebf8d..924c4616c3d9 100644 --- a/drivers/net/wireless/ath/ath9k/hif_usb.c +++ b/drivers/net/wireless/ath/ath9k/hif_usb.c @@ -1072,14 +1072,15 @@ static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev) */ static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev) { - struct device *parent = hif_dev->udev->dev.parent; + struct device *dev = &hif_dev->udev->dev; + struct device *parent = dev->parent; complete(&hif_dev->fw_done); if (parent) device_lock(parent); - device_release_driver(&hif_dev->udev->dev); + device_release_driver(dev); if (parent) device_unlock(parent); -- 2.20.1