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Reuse existing functionality from memdup_user() instead of keeping duplicate source code. This issue was detected by using the Coccinelle software. Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> CC: Arnd Bergmann <arnd@arndb.de> CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> CC: linux-kernel@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>