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| author | JUN FANG <jun_fang@foxitsoftware.com> | 2015-05-19 14:44:13 -0700 |
|---|---|---|
| committer | JUN FANG <jun_fang@foxitsoftware.com> | 2015-05-19 14:44:13 -0700 |
| commit | 59f4b44d1fbb259967ea518e0bf5fa76b0cc9767 (patch) | |
| tree | a1d6336676d6d70467a7fb94aa0e625b1dbc8c25 /core/src/fxcodec | |
| parent | 3b60890f6ee807a8bfc44056443f77603c23e6b0 (diff) | |
| download | pdfium-59f4b44d1fbb259967ea518e0bf5fa76b0cc9767.tar.xz | |
Fix Heap Overflow in CJBig2_Image::expand
Integer overflow in CJBig2_Image::expand.
It causes the size of reallocated is not
expected.
BUG=483981
R=tsepez@chromium.org
Review URL: https://codereview.chromium.org/1131023008
Diffstat (limited to 'core/src/fxcodec')
| -rw-r--r-- | core/src/fxcodec/jbig2/JBig2_Image.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/core/src/fxcodec/jbig2/JBig2_Image.cpp b/core/src/fxcodec/jbig2/JBig2_Image.cpp index 5da1fc63d0..03929b84c8 100644 --- a/core/src/fxcodec/jbig2/JBig2_Image.cpp +++ b/core/src/fxcodec/jbig2/JBig2_Image.cpp @@ -4,10 +4,12 @@ // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com -#include "JBig2_Image.h" +#include <limits.h> #include "../../../include/fxcrt/fx_basic.h" #include "../../../include/fxcrt/fx_coordinates.h" -#include <limits.h> +#include "../../../src/fxcrt/fx_safe_types.h" +#include "JBig2_Image.h" + CJBig2_Image::CJBig2_Image(FX_INT32 w, FX_INT32 h) { m_nWidth = w; @@ -768,7 +770,12 @@ void CJBig2_Image::expand(FX_INT32 h, FX_BOOL v) if (!m_pData) { return; } - m_pData = (FX_BYTE*)m_pModule->JBig2_Realloc(m_pData, h * m_nStride); + FX_SAFE_DWORD safeMemSize = pdfium::base::checked_cast<FX_DWORD>(h); + safeMemSize *= pdfium::base::checked_cast<FX_DWORD>(m_nStride); + if (!safeMemSize.IsValid()) { + return; + } + m_pData = (FX_BYTE*)m_pModule->JBig2_Realloc(m_pData, safeMemSize.ValueOrDie()); if(h > m_nHeight) { JBIG2_memset(m_pData + m_nHeight * m_nStride, v ? 0xff : 0, (h - m_nHeight)*m_nStride); } |