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authorBo Xu <bo_xu@foxitsoftware.com>2014-08-02 15:13:46 -0700
committerBo Xu <bo_xu@foxitsoftware.com>2014-08-02 15:13:46 -0700
commit465c2a84ba709d932040c9e80db508e93c138da6 (patch)
tree07396342b637775b5350e896ba99ac0834e6e2f9 /fpdfsdk/src/fpdfview.cpp
parent90d1f9b9fdcbdab22beec36ceddee782ac0f8a39 (diff)
downloadpdfium-465c2a84ba709d932040c9e80db508e93c138da6.tar.xz
When newPos == file size, the current block will not be read or Get. If this block is a crucial part of the document (like m_pTrailer), the program will exit with parse error and the document will not be rendered. BUG=None R=jun_fang@foxitsoftware.com Review URL: https://codereview.chromium.org/440563003
Diffstat (limited to 'fpdfsdk/src/fpdfview.cpp')
-rw-r--r--fpdfsdk/src/fpdfview.cpp46
1 files changed, 21 insertions, 25 deletions
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index 63d4fbdcde..af24e71b94 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -35,27 +35,25 @@ FX_BOOL CPDF_CustomAccess::GetByte(FX_DWORD pos, FX_BYTE& ch)
FX_BOOL CPDF_CustomAccess::GetBlock(FX_DWORD pos, FX_LPBYTE pBuf, FX_DWORD size)
{
- FX_SAFE_DWORD newPos = size;
- newPos += pos;
- if (!newPos.IsValid() || newPos.ValueOrDie() >= m_FileAccess.m_FileLen) {
- return FALSE;
- }
-
- return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, pos, pBuf, size);
+ FX_SAFE_DWORD newPos = size;
+ newPos += pos;
+ if (!newPos.IsValid() || newPos.ValueOrDie() > m_FileAccess.m_FileLen) {
+ return FALSE;
+ }
+ return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, pos, pBuf, size);
}
FX_BOOL CPDF_CustomAccess::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size)
{
- if (offset < 0) {
- return FALSE;
- }
- FX_SAFE_FILESIZE newPos = base::checked_cast<FX_FILESIZE, size_t>(size);
- newPos += offset;
- if (!newPos.IsValid() || newPos.ValueOrDie() >= m_FileAccess.m_FileLen) {
- return FALSE;
- }
-
- return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,(FX_LPBYTE) buffer, size);
+ if (offset < 0) {
+ return FALSE;
+ }
+ FX_SAFE_FILESIZE newPos = base::checked_cast<FX_FILESIZE, size_t>(size);
+ newPos += offset;
+ if (!newPos.IsValid() || newPos.ValueOrDie() > m_FileAccess.m_FileLen) {
+ return FALSE;
+ }
+ return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,(FX_LPBYTE) buffer, size);
}
//0 bit: FPDF_POLICY_MACHINETIME_ACCESS
@@ -301,15 +299,13 @@ public:
virtual FX_FILESIZE GetSize() {return m_size;}
virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size)
{
- if (offset < 0) {
- return FALSE;
- }
-
- FX_SAFE_FILESIZE newPos = base::checked_cast<FX_FILESIZE, size_t>(size);
- newPos += offset;
- if (!newPos.IsValid() || newPos.ValueOrDie() >= (FX_DWORD)m_size) return FALSE;
+ if (offset < 0) {
+ return FALSE;
+ }
+ FX_SAFE_FILESIZE newPos = base::checked_cast<FX_FILESIZE, size_t>(size);
+ newPos += offset;
+ if (!newPos.IsValid() || newPos.ValueOrDie() > (FX_DWORD)m_size) return FALSE;
FXSYS_memcpy(buffer, m_pBuf+offset, size);
-
return TRUE;
}
private: