c - 'bad address' error from copy_to_user -

i attempting copy custom struct kernel space user space. inside user space errno returns 'bad address'. usual cause of bad address error?

if(copy_to_user(info, &kernel_info, sizeof(struct prinfo))) 

bad address error means address location have given invalid. case have above guess because passing copy of info instead of pointer info's memory location.

looking @ docs, copy_to_user defined as

copy_to_user(void __user * to, const void * from, unsigned long n); 

so unless info variable pointer update code be:

if(copy_to_user(&info, &kernel_info, sizeof(struct prinfo)) ) {     //some stuff here guess }