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usb: dfu: check requested length (wLength) during DFU_UPLOAD #23190

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Merged
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Mar 2, 2020
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usb: dfu: check requested length (wLength) during DFU_UPLOAD #23190

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9 changes: 9 additions & 0 deletions subsys/usb/class/usb_dfu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -509,6 +509,15 @@ static int dfu_class_handle_req(struct usb_setup_packet *pSetup,
len = pSetup->wLength;
}

if (len > USB_DFU_MAX_XFER_SIZE) {
/*
* The host could requests more data as stated
* in wTransferSize. Limit upload length to the
* size of the request-buffer.
*/
len = USB_DFU_MAX_XFER_SIZE;
}

if (len) {
const struct flash_area *fa;

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