linux-kernel - Re: [PATCH v2 1/2] ACPI: NFIT: Fix incorrect calculation of idt size

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Date:   Fri, 15 Sep 2023 09:13:02 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Yu Liao <liaoyu15@...wei.com>, <dan.j.williams@...el.com>,
        <vishal.l.verma@...el.com>, <dave.jiang@...el.com>,
        <ira.weiny@...el.com>, <rafael@...nel.org>
CC:     <liaoyu15@...wei.com>, <liwei391@...wei.com>, <lenb@...nel.org>,
        <robert.moore@...el.com>, <linux-acpi@...r.kernel.org>,
        <nvdimm@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] ACPI: NFIT: Fix incorrect calculation of idt size

Yu Liao wrote:
> acpi_nfit_interleave's field 'line_offset' is switched to flexible array [1],
> but sizeof_idt() still calculates the size in the form of 1-element array.
> 
> Therefore, fix incorrect calculation in sizeof_idt().
> 
> [1] https://lore.kernel.org/lkml/2652195.BddDVKsqQX@kreacher/
> 
> Fixes: 2a5ab99847bd ("ACPICA: struct acpi_nfit_interleave: Replace 1-element array with flexible array")
> Cc: stable@...r.kernel.org # v6.4+
> Signed-off-by: Yu Liao <liaoyu15@...wei.com>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> ---
> v1 -> v2: add Dave's review tag and cc nvdimm@...ts.linux.dev
> ---
>  drivers/acpi/nfit/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 07204d482968..305f590c54a8 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -855,7 +855,7 @@ static size_t sizeof_idt(struct acpi_nfit_interleave *idt)
>  {
>  	if (idt->header.length < sizeof(*idt))
>  		return 0;
> -	return sizeof(*idt) + sizeof(u32) * (idt->line_count - 1);
> +	return sizeof(*idt) + sizeof(u32) * idt->line_count;
>  }
>  
>  static bool add_idt(struct acpi_nfit_desc *acpi_desc,
> -- 
> 2.25.1
>