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-rw-r--r--core/src/fxcrt/fx_basic_bstring.cpp6
-rw-r--r--core/src/fxcrt/fx_basic_wstring.cpp5
2 files changed, 9 insertions, 2 deletions
diff --git a/core/src/fxcrt/fx_basic_bstring.cpp b/core/src/fxcrt/fx_basic_bstring.cpp
index 2c8f7a766b..9cf084c2fb 100644
--- a/core/src/fxcrt/fx_basic_bstring.cpp
+++ b/core/src/fxcrt/fx_basic_bstring.cpp
@@ -4,6 +4,8 @@
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+#include <stddef.h> // For offsetof().
+
#include "../../include/fxcrt/fx_basic.h"
#include "../../../third_party/base/numerics/safe_math.h"
@@ -53,7 +55,9 @@ static CFX_StringData* FX_AllocString(int nLen)
return NULL;
}
- int overhead = sizeof(long) * 3 + 1; // 3 longs in header plus 1 for NUL.
+ // Fixed portion of header plus a NUL char not included in m_nAllocLength.
+ // sizeof(FX_CHAR) is always 1, used for consistency with CFX_Widestring.
+ int overhead = offsetof(CFX_StringData, m_String) + sizeof(FX_CHAR);
pdfium::base::CheckedNumeric<int> nSize = nLen;
nSize += overhead;
diff --git a/core/src/fxcrt/fx_basic_wstring.cpp b/core/src/fxcrt/fx_basic_wstring.cpp
index 42a7ad72a6..742f249e37 100644
--- a/core/src/fxcrt/fx_basic_wstring.cpp
+++ b/core/src/fxcrt/fx_basic_wstring.cpp
@@ -4,6 +4,8 @@
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+#include <stddef.h> // For offsetof().
+
#include "../../include/fxcrt/fx_basic.h"
#include "../../../third_party/base/numerics/safe_math.h"
@@ -15,7 +17,8 @@ static CFX_StringDataW* FX_AllocStringW(int nLen)
return NULL;
}
- int overhead = 3 * sizeof(long) + sizeof(FX_WCHAR); // +WCHAR is for NUL.
+ // Fixed portion of header plus a NUL wide char not in m_nAllocLength.
+ int overhead = offsetof(CFX_StringDataW, m_String) + sizeof(FX_WCHAR);
pdfium::base::CheckedNumeric<int> iSize = nLen;
iSize *= sizeof(FX_WCHAR);
iSize += overhead;