From: Jiri Kosina Date: Fri, 13 Aug 2010 10:19:45 +0000 (+0200) Subject: HID: hiddev: fix memory corruption due to invalid intfdata X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9c9e54a8df0be48aa359744f412377cc55c3b7d2;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git HID: hiddev: fix memory corruption due to invalid intfdata Commit bd25f4dd6972755579d0 ("HID: hiddev: use usb_find_interface, get rid of BKL") introduced using of private intfdata in hiddev for purpose of storing hiddev pointer. This is a problem, because intf pointer is already being set to struct hid_device pointer by HID core. This obviously lead to memory corruptions at device disconnect time, such as WARNING: at lib/kobject.c:595 kobject_put+0x37/0x4b() kobject: '(null)' (ffff88011e9cd898): is not initialized, yet kobject_put() is being called. Convert hiddev into accessing hiddev through struct hid_device which is in intfdata already. Reported-and-tested-by: Markus Trippelsdorf Reported-and-tested-by: Heinz Diehl Reported-and-tested-by: Alan Ott Signed-off-by: Jiri Kosina --- diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index f2850171a69b..0a29c51114aa 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -266,13 +266,15 @@ static int hiddev_open(struct inode *inode, struct file *file) { struct hiddev_list *list; struct usb_interface *intf; + struct hid_device *hid; struct hiddev *hiddev; int res; intf = usb_find_interface(&hiddev_driver, iminor(inode)); if (!intf) return -ENODEV; - hiddev = usb_get_intfdata(intf); + hid = usb_get_intfdata(intf); + hiddev = hid->hiddev; if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL))) return -ENOMEM; @@ -890,7 +892,6 @@ int hiddev_connect(struct hid_device *hid, unsigned int force) hid->hiddev = hiddev; hiddev->hid = hid; hiddev->exist = 1; - usb_set_intfdata(usbhid->intf, usbhid); retval = usb_register_dev(usbhid->intf, &hiddev_class); if (retval) { err_hid("Not able to get a minor for this device.");