HID: intel-thc-hid: intel-quickspi: bound GET_REPORT response to the caller buffer

quickspi_hid_raw_request() receives the caller's buffer length in len, but
quickspi_get_report() never sees it and copies the whole device-supplied
response into buf regardless:

    memcpy(buf, qsdev->report_buf, qsdev->report_len);

qsdev->report_len comes from the input report the touch controller returns,
while buf is sized to whatever the caller asked hidraw for through
HIDIOCGFEATURE or HIDIOCGINPUT.  A response larger than that overflows buf
with device-controlled content.

The intel-quicki2c sibling already passes the caller length down to
quicki2c_get_report() and validates the response against it before the
copy.  Do the same here.

Fixes: 4138f21115ae ("HID: intel-thc-hid: intel-quickspi: Complete THC QuickSPI driver")
Suggested-by: Sashiko AI <sashiko-bot@kernel.org>
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-5
Signed-off-by: HyeongJun An <sammiee5311@gmail.com>
Reviewed-by: Even Xu <even.xu@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

0 files changed, 0 insertions, 0 deletions