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 <[email protected]> Reviewed-by: Dave Jiang <[email protected]> --- 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
