[PATCH 2/2] x86/setup: Use struct_size() for setup_data sizes

[Thorsten Blum]

Use struct_size(), which provides additional compile-time checks for
structures with flexible array members (e.g., __must_be_array()), to
calculate struct setup_data sizes.

Signed-off-by: Thorsten Blum <blum@xxxxxxxxxx>
---
 arch/x86/kernel/setup.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index cda6adb9f69c..20facddee922 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -19,6 +19,7 @@
 #include <linux/iscsi_ibft.h>
 #include <linux/kexec_handover.h>
 #include <linux/memblock.h>
+#include <linux/overflow.h>
 #include <linux/panic_notifier.h>
 #include <linux/pci.h>
 #include <linux/random.h>
@@ -487,7 +488,7 @@ static void __init parse_setup_data(void)
 		u32 data_len, data_type;
 
 		data = early_memremap(pa_data, sizeof(*data));
-		data_len = data->len + sizeof(struct setup_data);
+		data_len = struct_size(data, data, data->len);
 		data_type = data->type;
 		pa_next = data->next;
 		early_memunmap(data, sizeof(*data));
@@ -584,7 +585,7 @@ static void __init memblock_x86_reserve_range_setup_data(void)
 		len = sizeof(*data);
 		pa_next = data->next;
 
-		memblock_reserve_kern(pa_data, sizeof(*data) + data->len);
+		memblock_reserve_kern(pa_data, struct_size(data, data, data->len));
 
 		if (data->type == SETUP_INDIRECT) {
 			len += data->len;