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Add boundary check for PtNode reading position.

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Bug: 10743878
Change-Id: I6727b12b0ef98bb9cfb3ca95aeab2c79749f47a2
This commit is contained in:
Keisuke Kuroyanagi 2013-09-16 18:34:34 +09:00
parent cdc2ce8c89
commit f874728496
2 changed files with 24 additions and 0 deletions
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22
native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp
View file

@ -25,6 +25,13 @@ namespace latinime {
void DynamicPatriciaTrieNodeReader::fetchNodeInfoFromBufferAndProcessMovedNode(const int nodePos,
const int maxCodePointCount, int *const outCodePoints) {
if (nodePos < 0 || nodePos >= mBuffer->getTailPosition()) {
AKLOGE("Fetching PtNode info form invalid dictionary position: %d, dictionary size: %d",
nodePos, mBuffer->getTailPosition());
ASSERT(false);
invalidatePtNodeInfo();
return;
}
const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(nodePos);
const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
int pos = nodePos;
@ -94,4 +101,19 @@ void DynamicPatriciaTrieNodeReader::fetchNodeInfoFromBufferAndProcessMovedNode(c
}
}
void DynamicPatriciaTrieNodeReader::invalidatePtNodeInfo() {
mHeadPos = NOT_A_VALID_WORD_POS;
mFlags = 0;
mParentPos = NOT_A_DICT_POS;
mCodePointCount = 0;
mProbabilityFieldPos = NOT_A_DICT_POS;
mProbability = NOT_A_PROBABILITY;
mChildrenPosFieldPos = NOT_A_DICT_POS;
mChildrenPos = NOT_A_DICT_POS;
mBigramLinkedNodePos = NOT_A_DICT_POS;
mShortcutPos = NOT_A_DICT_POS;
mBigramPos = NOT_A_DICT_POS;
mSiblingPos = NOT_A_VALID_WORD_POS;
}
}

2
native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
View file

@ -156,6 +156,8 @@ class DynamicPatriciaTrieNodeReader {
void fetchNodeInfoFromBufferAndProcessMovedNode(const int nodePos, const int maxCodePointCount,
int *const outCodePoints);
void invalidatePtNodeInfo();
};
} // namespace latinime
#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_NODE_READER_H */