Jes Sorensen <Jes.Sorensen@xxxxxxxxxx> writes:
> Xose Vazquez Perez <xose.vazquez@xxxxxxxxx> writes:
>> Hi,
>>
>> If I do:
>> # echo "0bda 8176" > /sys/bus/usb/drivers/rtl8xxxu/new_id
>
> Hi Xose,
>
> Yes please don't do that. The rtl8xxxu driver relies on the .driver_info
> field in struct use_device_id to carry information for the different
> types of devices. If you hot add a device like above, the driver will
> fail because that field now contains a NULL pointer.
>
> I should probably add a check for it in the probe function, but it will
> simply be there to spit out a warning that it doesn't work to hot add a
> device like this.
>
> If you build it with CONFIG_RTL8XXXU_UNTESTED the 0bda:8176 should be
> included in the device list.
>
> Cheers,
> Jes
Hi Xose,
I added the following patch to my tree to avoid this.
Cheers,
Jes
commit 9202f4947aac1d60084ee79c9b5294eb42ba59dc
Author: Jes Sorensen <Jes.Sorensen@xxxxxxxxxx>
Date: Thu Mar 17 13:53:48 2016 -0400
rtl8xxxu: Fix OOPS if user tries to add device via /sys
This driver relies on driver_info in struct usb_device_id, hence
adding a device via /sys/bus/usb/drivers/rtl8xxxu/new_id would result
in a NULL pointer dereference.
Instead print a message and return -ENODEV
Reported-by: Xose Vazquez Perez <xose.vazquez@xxxxxxxxx>
Signed-off-by: Jes Sorensen <Jes.Sorensen@xxxxxxxxxx>
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c
index 8d893f4..55fc00e 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c
@@ -9671,6 +9671,15 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
udev = usb_get_dev(interface_to_usbdev(interface));
+ if (!id->driver_info) {
+ dev_warn(&udev->dev,
+ "rtl8xxxu relies on driver_info in struct usb_device_id.\n");
+ dev_warn(&udev->dev,
+ "Adding a device via /sys/bus/usb/drivers/rtl8xxxu/new_id is not supported!\n");
+ ret = -ENODEV;
+ goto exit;
+ }
+
switch (id->idVendor) {
case USB_VENDOR_ID_REALTEK:
switch(id->idProduct) {
--
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