Re: [PATCH] mm: cma: fix corruption cma_sysfs_alloc_pages_count

[Dmitry Osipenko]

24.03.2021 22:20, Minchan Kim пишет:
>  static int __init cma_sysfs_init(void)
>  {
> -	int i = 0;
> +	struct kobject *cma_kobj_root;
> +	struct cma_kobject *cma_kobj;
>  	struct cma *cma;
> +	unsigned int i;

>  	while (--i >= 0) {

Do you realize that this doesn't work anymore?

>  		cma = &cma_areas[i];
> -		kobject_put(&cma->stat->kobj);
> -	}
>  
> -	kfree(cma_stats);
> -	kobject_put(cma_kobj);
> +		kobject_put(&cma->cma_kobj->kobj);
> +		kfree(cma->cma_kobj);

Freeing a null pointer?

> +		cma->cma_kobj = NULL;
> +	}
> +	kobject_put(cma_kobj_root);