From 0e13e7b448005612972eae36c0f698c21d1e2f8a Mon Sep 17 00:00:00 2001 From: Bastien Nocera Date: Thu, 15 Dec 2022 16:44:16 +0100 Subject: [PATCH] HID: logitech-hidpp: Guard FF init code against non-USB devices The Force Feedback code assumes that all the devices passed to it will be USB devices, but that might not be the case for emulated devices. Guard against a crash by checking the device type before poking at USB properties. Cc: stable@vger.kernel.org # v5.16+ Reported-by: Benjamin Tissoires Signed-off-by: Bastien Nocera Signed-off-by: Benjamin Tissoires Link: https://lore.kernel.org/r/20221215154416.111704-1-hadess@hadess.net --- drivers/hid/hid-logitech-hidpp.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index c6e4a96..abf2c95 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -2548,12 +2548,17 @@ static int hidpp_ff_init(struct hidpp_device *hidpp, struct hid_device *hid = hidpp->hid_dev; struct hid_input *hidinput; struct input_dev *dev; - const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor); - const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice); + struct usb_device_descriptor *udesc; + u16 bcdDevice; struct ff_device *ff; int error, j, num_slots = data->num_effects; u8 version; + if (!hid_is_usb(hid)) { + hid_err(hid, "device is not USB\n"); + return -ENODEV; + } + if (list_empty(&hid->inputs)) { hid_err(hid, "no inputs found\n"); return -ENODEV; @@ -2567,6 +2572,8 @@ static int hidpp_ff_init(struct hidpp_device *hidpp, } /* Get firmware release */ + udesc = &(hid_to_usb_dev(hid)->descriptor); + bcdDevice = le16_to_cpu(udesc->bcdDevice); version = bcdDevice & 255; /* Set supported force feedback capabilities */ -- 2.7.4