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BMFF: fix handling of boxes w/ zero length or type (backport #2612) #2614

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May 11, 2023
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BMFF: fix handling of boxes w/ zero length or type (backport #2612) #2614

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7 changes: 6 additions & 1 deletion src/bmffimage.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -134,7 +134,7 @@
// Allows boxHandler() to optimise the reading of files by identifying
// box types that we're not interested in. Box types listed here must
// not appear in the cases in switch (box_type) in boxHandler().
return box == TAG_mdat; // mdat is where the main image lives and can be huge
return box == 0 || box == TAG_mdat; // mdat is where the main image lives and can be huge
}

std::string BmffImage::mimeType() const
Expand Down Expand Up @@ -238,6 +238,11 @@
box_length = getULongLong(data.pData_, endian_);
}

if (box_length == 0) {
// Zero length is also valid and indicates box extends to the end of file.
box_length = pbox_end - address;

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}

// read data in box and restore file position
long restore = io_->tell();
enforce(box_length >= hdrsize, Exiv2::kerCorruptedMetadata);
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