diff options
| author | Caolán McNamara <caolanm@redhat.com> | 2016-12-22 13:35:31 +0000 |
|---|---|---|
| committer | Caolán McNamara <caolanm@redhat.com> | 2016-12-22 13:35:36 +0000 |
| commit | 7485fc2a1484f31631f62f97e5c64c0ae74c6416 (patch) | |
| tree | 1051e928ce36ee6b28f6e1ecb03df9ff46a59180 /vcl/source/filter/wmf/enhwmf.cxx | |
| parent | 88dad8fe1a94055dcbb05a6e6f0df2d007914a45 (diff) | |
Resolves: ofz#313 cbBmiSrc > getDIBV5HeaderSize
Change-Id: I67fb67dc0a4cb609b8f1391c1eb6dd395755a933
Diffstat (limited to 'vcl/source/filter/wmf/enhwmf.cxx')
| -rw-r--r-- | vcl/source/filter/wmf/enhwmf.cxx | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/vcl/source/filter/wmf/enhwmf.cxx b/vcl/source/filter/wmf/enhwmf.cxx index 7f91ffc3d14c..a8118a274744 100644 --- a/vcl/source/filter/wmf/enhwmf.cxx +++ b/vcl/source/filter/wmf/enhwmf.cxx @@ -1252,13 +1252,22 @@ bool EnhWMFReader::ReadEnhWMF() else { const sal_uInt32 nSourceSize = cbBmiSrc + cbBitsSrc + 14; - if ( nSourceSize <= ( nEndPos - nStartPos ) ) + bool bSafeRead = nSourceSize <= (nEndPos - nStartPos); + sal_uInt32 nDeltaToDIB5HeaderSize(0); + const bool bReadAlpha(0x01 == aFunc.aAlphaFormat); + if (bSafeRead && bReadAlpha) { // we need to read alpha channel data if AlphaFormat of BLENDFUNCTION is // AC_SRC_ALPHA (==0x01). To read it, create a temp DIB-File which is ready // for DIB-5 format - const bool bReadAlpha(0x01 == aFunc.aAlphaFormat); - const sal_uInt32 nDeltaToDIB5HeaderSize(bReadAlpha ? getDIBV5HeaderSize() - cbBmiSrc : 0); + const sal_uInt32 nHeaderSize = getDIBV5HeaderSize(); + if (cbBmiSrc > nHeaderSize) + bSafeRead = false; + else + nDeltaToDIB5HeaderSize = nHeaderSize - cbBmiSrc; + } + if (bSafeRead) + { const sal_uInt32 nTargetSize(cbBmiSrc + nDeltaToDIB5HeaderSize + cbBitsSrc + 14); char* pBuf = new char[ nTargetSize ]; SvMemoryStream aTmp( pBuf, nTargetSize, StreamMode::READ | StreamMode::WRITE ); @@ -1277,7 +1286,7 @@ bool EnhWMFReader::ReadEnhWMF() pWMF->Seek( nStart + offBmiSrc ); pWMF->ReadBytes(pBuf + 14, cbBmiSrc); - if(bReadAlpha) + if (bReadAlpha) { // need to add values for all stuff that DIBV5Header is bigger // than DIBInfoHeader, all values are correctly initialized to zero, |