The following EROFS patch will use this helper to handle overflow
ALIGN_UP() cases.
Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
include/grub/safemath.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/grub/safemath.h b/include/grub/safemath.h
index fbd9b5925..baaea0ef4 100644
--- a/include/grub/safemath.h
+++ b/include/grub/safemath.h
@@ -32,6 +32,22 @@
#define grub_cast(a, res) grub_add ((a), 0, (res))
+#define ALIGN_UP_OVF(v, align, res) \
+({ \
+ bool __failed; \
+ typeof(v) a; \
+ \
+ __failed = grub_sub ((typeof(v))(align), 1, &a); \
+ if (__failed == false) \
+ { \
+ __failed = grub_add (v, a, res); \
+ if (__failed == false) \
+ { \
+ *(res) &= ~a; \
+ } \
+ } \
+__failed;})
+
#else
#error gcc 5.1 or newer or clang 8.0 or newer is required
#endif
--
2.39.3
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