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[pull] master from OSGeo:master #146

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Jan 12, 2025
Merged

[pull] master from OSGeo:master #146

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6 changes: 6 additions & 0 deletions third_party/libertiff/libertiff.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1217,6 +1217,12 @@ class Image
uint64_t offset = imageOffset;
if LIBERTIFF_CONSTEXPR (isBigTIFF)
{
// To prevent unsigned integer overflows in later additions. The
// theoretical max should be much closer to UINT64_MAX, but half of
// it is already more than needed in practice :-)
if (offset >= std::numeric_limits<uint64_t>::max() / 2)
return nullptr;

const auto tagCount64Bit = rc->read<uint64_t>(offset, ok);
// Artificially limit to the same number of entries as ClassicTIFF
if (tagCount64Bit > std::numeric_limits<uint16_t>::max())
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