Messages in this thread Patch in this message | | | From | Bastien Nocera <> | Subject | [PATCH] HID: logitech-hidpp: Guard FF init code against non-USB devices | Date | Thu, 15 Dec 2022 16:44:16 +0100 |
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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.
Reported-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Bastien Nocera <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 7075c887ec50..08ad19097e9e 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -2746,12 +2746,17 @@ 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; @@ -2765,6 +2770,8 @@ 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 */ -- 2.38.1
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