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fix(png): bound transparency chunk detection to the input

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hazzardouslysolid authored and validation agent committed 2026-10-10 09:28:30 +08:00
1 parent c9da0f93cf
commit b5903e80da
3 files changed
+14 -1
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core/Decoder/Png/src/Png.cpp
+1 -1
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@@ -138,9 +138,9 @@ std::optional<Header> ParseHeader(std::span<const std::uint8_t> png) {
while (png.size() - offset >= CHUNK_OVERHEAD) {
const std::uint32_t length = readBigEndian32(&png[offset]);
const std::uint8_t* type = &png[offset + 4];
if (length > png.size() - offset - CHUNK_OVERHEAD) break;
if (isChunkType(type, "tRNS")) header.hasTransparency = true;
if (isChunkType(type, "tRNS") || isChunkType(type, "IDAT") || isChunkType(type, "IEND")) break;
if (length > png.size() - offset - CHUNK_OVERHEAD) break;
offset += CHUNK_OVERHEAD + length;
}
return header;