diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2018-05-03 17:30:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:47:16 +0200 |
| commit | 2679c2231bc3fb260f74e1faf7d6810427b1fc6e (patch) | |
| tree | 87d4dfdc517f284bb65f0007cfa63742d006b5bc /drivers | |
| parent | 64b40135e41f677eeef1ad7de98cc1a02ea79ce3 (diff) | |
xhci: Fix use-after-free in xhci_free_virt_device
commit 44a182b9d17765514fa2b1cc911e4e65134eef93 upstream.
KASAN found a use-after-free in xhci_free_virt_device+0x33b/0x38e
where xhci_free_virt_device() sets slot id to 0 if udev exists:
if (dev->udev && dev->udev->slot_id)
dev->udev->slot_id = 0;
dev->udev will be true even if udev is freed because dev->udev is
not set to NULL.
set dev->udev pointer to NULL in xhci_free_dev()
The original patch went to stable so this fix needs to be applied
there as well.
Fixes: a400efe455f7 ("xhci: zero usb device slot_id member when disabling and freeing a xhci slot")
Cc: <stable@vger.kernel.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/xhci.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index c190fabd1875..e9f5f9c32b49 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -3656,6 +3656,9 @@ void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev) } spin_lock_irqsave(&xhci->lock, flags); + + virt_dev->udev = NULL; + /* Don't disable the slot if the host controller is dead. */ state = readl(&xhci->op_regs->status); if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) || |