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The memdup_user() helper function can be used to duplicate a memory region from user-space to kernel-space. There is no need to open code the same logic using kmalloc() and copy_from_user() instead. This was found with make coccicheck that reported the following warning: drivers/input/joydev.c:447:10-17: WARNING opportunity for memdup_user drivers/input/joydev.c:483:10-17: WARNING opportunity for memdup_user Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>