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b58d6021d4
copy_from_user() returns the number of bytes remaining to be copied, and it fails if user pointer is invalid, so return -EFAULT so that the user gets a FAULT. Signed-off-by: Devendra Naga <devendra.aaru@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>