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| author | Chris Palmer <palmer@google.com> | 2014-07-08 14:02:05 -0700 |
|---|---|---|
| committer | Chris Palmer <palmer@google.com> | 2014-07-08 14:02:05 -0700 |
| commit | e7ee98e4c6fd56c9e930194e9fc11cc10e8293a1 (patch) | |
| tree | d783f4c78b85595a9dd72149f97e17310d2bf44d /core/src | |
| parent | 30f2ff16bf30ccaa66bb7e144873fc29b4bcbdc2 (diff) | |
| download | pdfium-e7ee98e4c6fd56c9e930194e9fc11cc10e8293a1.tar.xz | |
Fix for UMR in CXML_Parser::GetCharRef.
BUG=387822
R=jun_fang@foxitsoftware.com
Review URL: https://codereview.chromium.org/367383002
Diffstat (limited to 'core/src')
| -rw-r--r-- | core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp index 3bfd37fe4a..926117722f 100644 --- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp +++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp @@ -7,6 +7,7 @@ #include "../../../include/fpdfapi/fpdf_parser.h" #include "../../../include/fpdfapi/fpdf_module.h" #include "../../../include/fpdfapi/fpdf_page.h" +#include "../../../../third_party/numerics/safe_math.h" #include "../fpdf_page/pageint.h" #include <limits.h> #define _PARSER_OBJECT_LEVLE_ 64 @@ -2408,25 +2409,27 @@ CPDF_Stream* CPDF_SyntaxParser::ReadStream(CPDF_Dictionary* pDict, PARSE_CONTEXT FX_DWORD objnum, FX_DWORD gennum) { CPDF_Object* pLenObj = pDict->GetElement(FX_BSTRC("Length")); - FX_DWORD len = 0; + FX_FILESIZE len = 0; if (pLenObj && ((pLenObj->GetType() != PDFOBJ_REFERENCE) || ((((CPDF_Reference*)pLenObj)->GetObjList() != NULL) && ((CPDF_Reference*)pLenObj)->GetRefObjNum() != objnum))) { - FX_FILESIZE pos = m_Pos; - if (pLenObj) { - len = pLenObj->GetInteger(); - } - m_Pos = pos; - if (len > 0x40000000) { - return NULL; - } + len = pLenObj->GetInteger(); } + ToNextLine(); FX_FILESIZE StreamStartPos = m_Pos; if (pContext) { pContext->m_DataStart = m_Pos; } - m_Pos += len; + + base::CheckedNumeric<FX_FILESIZE> pos = m_Pos; + pos += len; + if (pos.IsValid() && pos.ValueOrDie() < m_FileLen) { + m_Pos = pos.ValueOrDie(); + } else { + return NULL; + } + CPDF_CryptoHandler* pCryptoHandler = objnum == (FX_DWORD)m_MetadataObjnum ? NULL : m_pCryptoHandler; if (pCryptoHandler == NULL) { FX_FILESIZE SavedPos = m_Pos; |