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| Do | Don't | |----|-------| | Validate user input with copy_from_user() | Dereference user pointers directly | | Use GFP_KERNEL only in sleepable contexts | Sleep inside spinlock or interrupt | | Check return codes of kmalloc() | Ignore memory allocation failures | | Use module_param() for safe parameters | Expose arbitrary kernel memory via sysfs | | Release resources in __exit | Forget to free IRQ or memory |
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