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ani: Read chunk elements one at a time instead all at once

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This way if the file is malformed and there's not that many elements we don't
try allocate too much memory to read into

BUGS: 498368
This commit is contained in:
Albert Astals Cid 2025-01-14 00:37:20 +01:00
parent f296c38daf
commit f39ca9dc9b
1 changed files with 7 additions and 5 deletions
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12
src/imageformats/ani.cpp
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@ -376,16 +376,18 @@ bool ANIHandler::ensureScanned() const
mutableThis->m_imageCount = aniHeader->nSteps;
mutableThis->m_displayRate = aniHeader->iDispRate;
} else if (chunkId == "rate" || chunkId == "seq ") {
const QByteArray data = device()->read(chunkSize);
if (static_cast<quint32_le>(data.size()) != chunkSize || data.size() % sizeof(quint32_le) != 0) {
if (chunkSize % sizeof(quint32_le) != 0) {
return false;
}
// TODO should we check that the number of rate entries matches nSteps?
auto *dataPtr = data.data();
QList<int> list;
for (int i = 0; i < data.size(); i += sizeof(quint32_le)) {
const auto entry = *(reinterpret_cast<const quint32_le *>(dataPtr + i));
for (unsigned int i = 0; i < chunkSize; i += sizeof(quint32_le)) {
const QByteArray data = device()->read(sizeof(quint32_le));
if (data.size() != sizeof(quint32_le)) {
return false;
}
const auto entry = *(reinterpret_cast<const quint32_le *>(data.data()));
list.append(entry);
}