firewire: check cdev response length
Add a check that the data length in the SEND_RESPONSE ioctl is correct. Incidentally, this also fixes the previously wrong response length of software-handled lock requests. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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