From: Szymon Heidrich szymon.heidrich@gmail.com
commit 4c92670b16727365699fe4b19ed32013bab2c107 upstream.
Setup function uvc_function_setup permits control transfer requests with up to 64 bytes of payload (UVC_MAX_REQUEST_SIZE), data stage handler for OUT transfer uses memcpy to copy req->actual bytes to uvc_event->data.data array of size 60. This may result in an overflow of 4 bytes.
Fixes: cdda479f15cd ("USB gadget: video class function driver") Cc: stable stable@kernel.org Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Daniel Scally dan.scally@ideasonboard.com Signed-off-by: Szymon Heidrich szymon.heidrich@gmail.com Link: https://lore.kernel.org/r/20221206141301.51305-1-szymon.heidrich@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/function/f_uvc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -219,8 +219,9 @@ uvc_function_ep0_complete(struct usb_ep
memset(&v4l2_event, 0, sizeof(v4l2_event)); v4l2_event.type = UVC_EVENT_DATA; - uvc_event->data.length = req->actual; - memcpy(&uvc_event->data.data, req->buf, req->actual); + uvc_event->data.length = min_t(unsigned int, req->actual, + sizeof(uvc_event->data.data)); + memcpy(&uvc_event->data.data, req->buf, uvc_event->data.length); v4l2_event_queue(&uvc->vdev, &v4l2_event); } }