| From 80e457699a8dbdd70f2d26911e46f538645c55fc Mon Sep 17 00:00:00 2001 |
| From: Yu Chen <chenyu56@huawei.com> |
| Date: Fri, 1 Dec 2017 13:41:20 +0200 |
| Subject: usb: xhci: fix panic in xhci_free_virt_devices_depth_first |
| |
| From: Yu Chen <chenyu56@huawei.com> |
| |
| commit 80e457699a8dbdd70f2d26911e46f538645c55fc upstream. |
| |
| Check vdev->real_port 0 to avoid panic |
| [ 9.261347] [<ffffff800884a390>] xhci_free_virt_devices_depth_first+0x58/0x108 |
| [ 9.261352] [<ffffff800884a814>] xhci_mem_cleanup+0x1bc/0x570 |
| [ 9.261355] [<ffffff8008842de8>] xhci_stop+0x140/0x1c8 |
| [ 9.261365] [<ffffff80087ed304>] usb_remove_hcd+0xfc/0x1d0 |
| [ 9.261369] [<ffffff80088551c4>] xhci_plat_remove+0x6c/0xa8 |
| [ 9.261377] [<ffffff80086e928c>] platform_drv_remove+0x2c/0x70 |
| [ 9.261384] [<ffffff80086e6ea0>] __device_release_driver+0x80/0x108 |
| [ 9.261387] [<ffffff80086e7a1c>] device_release_driver+0x2c/0x40 |
| [ 9.261392] [<ffffff80086e5f28>] bus_remove_device+0xe0/0x120 |
| [ 9.261396] [<ffffff80086e2e34>] device_del+0x114/0x210 |
| [ 9.261399] [<ffffff80086e9e00>] platform_device_del+0x30/0xa0 |
| [ 9.261403] [<ffffff8008810bdc>] dwc3_otg_work+0x204/0x488 |
| [ 9.261407] [<ffffff80088133fc>] event_work+0x304/0x5b8 |
| [ 9.261414] [<ffffff80080e31b0>] process_one_work+0x148/0x490 |
| [ 9.261417] [<ffffff80080e3548>] worker_thread+0x50/0x4a0 |
| [ 9.261421] [<ffffff80080e9ea0>] kthread+0xe8/0x100 |
| [ 9.261427] [<ffffff8008083680>] ret_from_fork+0x10/0x50 |
| |
| The problem can occur if xhci_plat_remove() is called shortly after |
| xhci_plat_probe(). While xhci_free_virt_devices_depth_first been |
| called before the device has been setup and get real_port initialized. |
| The problem occurred on Hikey960 and was reproduced by Guenter Roeck |
| on Kevin with chromeos-4.4. |
| |
| Fixes: ee8665e28e8d ("xhci: free xhci virtual devices with leaf nodes first") |
| Cc: Guenter Roeck <groeck@google.com> |
| Reviewed-by: Guenter Roeck <groeck@chromium.org> |
| Tested-by: Guenter Roeck <linux@roeck-us.net> |
| Signed-off-by: Fan Ning <fanning4@hisilicon.com> |
| Signed-off-by: Li Rui <lirui39@hisilicon.com> |
| Signed-off-by: yangdi <yangdi10@hisilicon.com> |
| Signed-off-by: Yu Chen <chenyu56@huawei.com> |
| Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/usb/host/xhci-mem.c | 7 +++++++ |
| 1 file changed, 7 insertions(+) |
| |
| --- a/drivers/usb/host/xhci-mem.c |
| +++ b/drivers/usb/host/xhci-mem.c |
| @@ -947,6 +947,12 @@ void xhci_free_virt_devices_depth_first( |
| if (!vdev) |
| return; |
| |
| + if (vdev->real_port == 0 || |
| + vdev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) { |
| + xhci_dbg(xhci, "Bad vdev->real_port.\n"); |
| + goto out; |
| + } |
| + |
| tt_list_head = &(xhci->rh_bw[vdev->real_port - 1].tts); |
| list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) { |
| /* is this a hub device that added a tt_info to the tts list */ |
| @@ -960,6 +966,7 @@ void xhci_free_virt_devices_depth_first( |
| } |
| } |
| } |
| +out: |
| /* we are now at a leaf device */ |
| xhci_free_virt_device(xhci, slot_id); |
| } |