efi: widen operand to avoid overflow

CID #1287141.

diff --git a/src/boot/efi/splash.c b/src/boot/efi/splash.c
index 81d6439f434495fe971b3aa5f911c494da644dcd..470ea3e2cc85a57956ebb84aff6770159a158f33 100644 (file)
--- a/src/boot/efi/splash.c
+++ b/src/boot/efi/splash.c
@@ -97,7 +97,7 @@ EFI_STATUS bmp_parse_header(UINT8 *bmp, UINTN size, struct bmp_dib **ret_dib,
                 return EFI_UNSUPPORTED;
         }
 
-        row_size = (((dib->depth * dib->x) + 31) / 32) * 4;
+        row_size = ((UINTN) dib->depth * dib->x + 31) / 32 * 4;
         if (file->size - file->offset <  dib->y * row_size)
                 return EFI_INVALID_PARAMETER;
         if (row_size * dib->y > 64 * 1024 * 1024)