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Boundary check for children creating of PatriciaTriePolicy. 

Bug: 10537529
Change-Id: I0cd8b6de230795498395ca08789ccc1c74780f2c
main
Keisuke Kuroyanagi 2013-09-25 19:54:31 +09:00
parent 4350a93aa5
commit 009dcac33f
2 changed files with 14 additions and 0 deletions
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12
native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.cpp
View File

@ -31,9 +31,21 @@ void PatriciaTriePolicy::createAndGetAllChildNodes(const DicNode *const dicNode,
return;
}
int nextPos = dicNode->getChildrenPos();
if (nextPos < 0 || nextPos >= mDictBufferSize) {
AKLOGE("Children PtNode array position is invalid. pos: %d, dict size: %d",
nextPos, mDictBufferSize);
ASSERT(false);
return;
}
const int childCount = PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(
mDictRoot, &nextPos);
for (int i = 0; i < childCount; i++) {
if (nextPos < 0 || nextPos >= mDictBufferSize) {
AKLOGE("Child PtNode position is invalid. pos: %d, dict size: %d, childCount: %d / %d",
nextPos, mDictBufferSize, i, childCount);
ASSERT(false);
return;
}
nextPos = createAndGetLeavingChildNode(dicNode, nextPos, childDicNodes);
}
}

2
native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h
View File

@ -36,6 +36,7 @@ class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
PatriciaTriePolicy(const MmappedBuffer *const buffer)
: mBuffer(buffer), mHeaderPolicy(mBuffer->getBuffer(), buffer->getBufferSize()),
mDictRoot(mBuffer->getBuffer() + mHeaderPolicy.getSize()),
mDictBufferSize(mBuffer->getBufferSize() - mHeaderPolicy.getSize()),
mBigramListPolicy(mDictRoot), mShortcutListPolicy(mDictRoot) {}
~PatriciaTriePolicy() {
@ -118,6 +119,7 @@ class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
const MmappedBuffer *const mBuffer;
const HeaderPolicy mHeaderPolicy;
const uint8_t *const mDictRoot;
const int mDictBufferSize;
const BigramListPolicy mBigramListPolicy;
const ShortcutListPolicy mShortcutListPolicy;