diff options
| author | Szymon Heidrich | 2022-12-06 15:13:01 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2022-12-21 17:48:06 +0100 |
| commit | d1a92bb8d697f170d93fe922da763d7d156b8841 (patch) | |
| tree | f69139fa1935af554fe7da1fa0c46e81691b15c9 /drivers/usb/gadget | |
| parent | 2cd2e9322726a487acf224431fbfc96f6c8880c9 (diff) | |
usb: gadget: uvc: Prevent buffer overflow in setup handler
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>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/function/f_uvc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 6e196e06181e..4419b7972e78 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -216,8 +216,9 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req) 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); } } |