[libunwind] 710590e - [libunwind] Undefined behaviour pointer arithmetic with null pointer (#98648)
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Mon Aug 5 02:16:55 PDT 2024
Author: Daniel Kiss
Date: 2024-08-05T11:16:51+02:00
New Revision: 710590e33d19649f08c716d827eb465e3a132d23
URL: https://github.com/llvm/llvm-project/commit/710590e33d19649f08c716d827eb465e3a132d23
DIFF: https://github.com/llvm/llvm-project/commit/710590e33d19649f08c716d827eb465e3a132d23.diff
LOG: [libunwind] Undefined behaviour pointer arithmetic with null pointer (#98648)
Fixes #91144
Added:
Modified:
libunwind/src/UnwindCursor.hpp
Removed:
################################################################################
diff --git a/libunwind/src/UnwindCursor.hpp b/libunwind/src/UnwindCursor.hpp
index 06e654197351d..ce6dced535e78 100644
--- a/libunwind/src/UnwindCursor.hpp
+++ b/libunwind/src/UnwindCursor.hpp
@@ -230,8 +230,8 @@ void DwarfFDECache<A>::iterateCacheEntries(void (*func)(
}
#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
-
-#define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field))
+#define arrayoffsetof(type, index, field) \
+ (sizeof(type) * (index) + offsetof(type, field))
#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
template <typename A> class UnwindSectionHeader {
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