diff options
Diffstat (limited to 'vcl/source/gdi/pngread.cxx')
| -rw-r--r-- | vcl/source/gdi/pngread.cxx | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/vcl/source/gdi/pngread.cxx b/vcl/source/gdi/pngread.cxx index 6cf9828f682b..09bbc66b695b 100644 --- a/vcl/source/gdi/pngread.cxx +++ b/vcl/source/gdi/pngread.cxx @@ -596,6 +596,16 @@ bool PNGReaderImpl::ImplReadHeader( const Size& rPreviewSizeHint ) if ( nScansize64 > SAL_MAX_UINT32 ) return false; + // assume max theoretical compression of 1:1032 + sal_uInt64 nMinSizeRequired = (nScansize64 * maOrigSize.Height()) / 1032; + if (nMinSizeRequired > mnStreamSize) + { + SAL_WARN("vcl.gdi", "overlarge png dimensions: " << + maOrigSize.Width() << " x " << maOrigSize.Height() << " depth: " << (int)mnPngDepth << + " couldn't be supplied by file length " << mnStreamSize << " at least " << nMinSizeRequired << " needed "); + return false; + } + mnScansize = static_cast< sal_uInt32 >( nScansize64 ); // calculate target size from original size and the preview hint |