boot: avoid 32-bit calculation for a 64-bit lvalue

Coverity CID#1399116:
> Potentially overflowing expression
> gpt_header_buffer.gpt_header.SizeOfPartitionEntry * gpt_header_buffer.gpt_header.NumberOfPartitionEntries
> with type unsigned int (32 bits, unsigned) is evaluated using 32-bit
> arithmetic, and then used in a context that expects an expression of type
> UINTN (64 bits, unsigned).

Let's import the ALIGN_TO macro to sd-boot and use it to avoid the issue.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h
index 8c5e35ad25..cef127f400 100644
--- a/src/boot/efi/util.h
+++ b/src/boot/efi/util.h
@@ -7,6 +7,10 @@
 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
 #define OFFSETOF(x,y) __builtin_offsetof(x,y)
 
+static inline UINTN ALIGN_TO(UINTN l, UINTN ali) {
+        return ((l + ali - 1) & ~(ali - 1));
+}
+
 static inline const CHAR16 *yes_no(BOOLEAN b) {
         return b ? L"yes" : L"no";
 }