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authornpm <npm@chromium.org>2016-10-04 10:15:55 -0700
committerCommit bot <commit-bot@chromium.org>2016-10-04 10:15:55 -0700
commit89f9ee3b8f3b4756f05ff48055f4bff7353201e2 (patch)
tree5f240641f202d041eef3424ed7db9e9492e49764 /core/fpdfapi/fpdf_font
parent78c271dd9ee883f4e31e41a8adda8e615c84ad63 (diff)
downloadpdfium-89f9ee3b8f3b4756f05ff48055f4bff7353201e2.tar.xz
Use FX_SAFE_UINT32 on CPDF_ToUnicodeMap::Load
m_Map maps to unsigned integer, but m_MultiCharBuf.GetLength() returns an integer. There will be integer overflow if the length is big, and UBSAN will complain. Thus, using FX_SAFE_UINT32. Replacing with uint32 would work as well: the point is to consider the length as uint instead of int. BUG=chromium:652232 Review-Url: https://codereview.chromium.org/2393573002
Diffstat (limited to 'core/fpdfapi/fpdf_font')
-rw-r--r--core/fpdfapi/fpdf_font/fpdf_font.cpp16
1 files changed, 13 insertions, 3 deletions
diff --git a/core/fpdfapi/fpdf_font/fpdf_font.cpp b/core/fpdfapi/fpdf_font/fpdf_font.cpp
index cff5223a00..825cd61b52 100644
--- a/core/fpdfapi/fpdf_font/fpdf_font.cpp
+++ b/core/fpdfapi/fpdf_font/fpdf_font.cpp
@@ -18,6 +18,7 @@
#include "core/fpdfapi/fpdf_parser/cpdf_simple_parser.h"
#include "core/fpdfapi/fpdf_parser/cpdf_stream_acc.h"
#include "core/fxcrt/fx_ext.h"
+#include "core/fxcrt/fx_safe_types.h"
#include "core/fxge/fx_freetype.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/stl_util.h"
@@ -224,7 +225,10 @@ void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
if (len == 1) {
m_Map[srccode] = destcode.GetAt(0);
} else {
- m_Map[srccode] = m_MultiCharBuf.GetLength() * 0x10000 + 0xffff;
+ FX_SAFE_UINT32 uni = m_MultiCharBuf.GetLength();
+ uni *= 0x10000;
+ uni += 0xffff;
+ m_Map[srccode] = uni.ValueOrDie();
m_MultiCharBuf.AppendChar(destcode.GetLength());
m_MultiCharBuf << destcode;
}
@@ -255,7 +259,10 @@ void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
if (len == 1) {
m_Map[code] = destcode.GetAt(0);
} else {
- m_Map[code] = m_MultiCharBuf.GetLength() * 0x10000 + 0xffff;
+ FX_SAFE_UINT32 uni = m_MultiCharBuf.GetLength();
+ uni *= 0x10000;
+ uni += 0xffff;
+ m_Map[code] = uni.ValueOrDie();
m_MultiCharBuf.AppendChar(destcode.GetLength());
m_MultiCharBuf << destcode;
}
@@ -278,7 +285,10 @@ void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
} else {
retcode = StringDataAdd(destcode);
}
- m_Map[code] = m_MultiCharBuf.GetLength() * 0x10000 + 0xffff;
+ FX_SAFE_UINT32 uni = m_MultiCharBuf.GetLength();
+ uni *= 0x10000;
+ uni += 0xffff;
+ m_Map[code] = uni.ValueOrDie();
m_MultiCharBuf.AppendChar(retcode.GetLength());
m_MultiCharBuf << retcode;
destcode = retcode;