Yu Liao wrote:
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worst scenario, could lead to heap overflows.
>
> Signed-off-by: Yu Liao <liaoy...@huawei.com>
> Reviewed-by: Dave Jiang <dave.ji...@intel.com>
Reviewed-by: Ira Weiny <ira.we...@intel.com>
> ---
> drivers/acpi/nfit/core.c | 10 ++++------
> 1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 305f590c54a8..2f7217600307 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -712,8 +712,7 @@ static bool add_spa(struct acpi_nfit_desc *acpi_desc,
> }
> }
>
> - nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa) + sizeof_spa(spa),
> - GFP_KERNEL);
> + nfit_spa = devm_kzalloc(dev, struct_size(nfit_spa, spa, 1), GFP_KERNEL);
> if (!nfit_spa)
> return false;
> INIT_LIST_HEAD(&nfit_spa->list);
> @@ -741,7 +740,7 @@ static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
> return true;
> }
>
> - nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev) + sizeof(*memdev),
> + nfit_memdev = devm_kzalloc(dev, struct_size(nfit_memdev, memdev, 1),
> GFP_KERNEL);
> if (!nfit_memdev)
> return false;
> @@ -812,8 +811,7 @@ static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
> return true;
> }
>
> - nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr) + sizeof(*dcr),
> - GFP_KERNEL);
> + nfit_dcr = devm_kzalloc(dev, struct_size(nfit_dcr, dcr, 1), GFP_KERNEL);
> if (!nfit_dcr)
> return false;
> INIT_LIST_HEAD(&nfit_dcr->list);
> @@ -855,7 +853,7 @@ 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;
> + return struct_size(idt, line_offset, idt->line_count);
> }
>
> static bool add_idt(struct acpi_nfit_desc *acpi_desc,
> --
> 2.25.1
>
