Re: [RFC PATCH] fs null_blk: Null pointer deference problem in alloc_page_buffers

[Jeff Moyer]

Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx> writes:

> diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
> index a2e69d2..6b0e049 100644
> --- a/drivers/block/null_blk.c
> +++ b/drivers/block/null_blk.c
> @@ -535,6 +535,11 @@ static int null_add_dev(void)
>  	if (!nullb)
>  		return -ENOMEM;
>  
> +	if (bs > PAGE_SIZE) {
> +		WARN(1, "Invalid block size. Setting it to 4096\n");
> +		bs = 4096;
> +	}
> +

Why are you hard-coding 4k instead of just using PAGE_SIZE?

Cheers,
Jeff
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