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We allocate "len" number of chars so we should put the NUL at "len - 1" to avoid corrupting memory. Btw, strlen_user() is different from the normal strlen() function because it includes NUL terminator in the count. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Helge Deller <deller@gmx.de>