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Add boundary check for v4 bigram reading.

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Bug: 14496386
Change-Id: Iedd3445c3222a777a2476beed7d9eb53773f406c
This commit is contained in:
Keisuke Kuroyanagi 2014-05-27 19:29:35 +09:00
parent d3642a2a58
commit f9ce867d80
2 changed files with 19 additions and 3 deletions
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8
native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.cpp
View File

@ -23,9 +23,11 @@ namespace latinime {
const BigramEntry BigramDictContent::getBigramEntryAndAdvancePosition(
int *const bigramEntryPos) const {
const BufferWithExtendableBuffer *const bigramListBuffer = getContentBuffer();
if (*bigramEntryPos < 0 || *bigramEntryPos >= bigramListBuffer->getTailPosition()) {
AKLOGE("Invalid bigram entry position. bigramEntryPos: %d, bufSize: %d",
*bigramEntryPos, bigramListBuffer->getTailPosition());
const int bigramEntryTailPos = (*bigramEntryPos) + getBigramEntrySize();
if (*bigramEntryPos < 0 || bigramEntryTailPos > bigramListBuffer->getTailPosition()) {
AKLOGE("Invalid bigram entry position. bigramEntryPos: %d, bigramEntryTailPos: %d, "
"bufSize: %d", *bigramEntryPos, bigramEntryTailPos,
bigramListBuffer->getTailPosition());
ASSERT(false);
return BigramEntry(false /* hasNext */, NOT_A_PROBABILITY,
Ver4DictConstants::NOT_A_TERMINAL_ID);

14
native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h
View File

@ -99,6 +99,20 @@ class BigramDictContent : public SparseTableDictContent {
return hasNext ? Ver4DictConstants::BIGRAM_HAS_NEXT_MASK : 0;
}
int getBigramEntrySize() const {
if (mHasHistoricalInfo) {
return Ver4DictConstants::BIGRAM_FLAGS_FIELD_SIZE
+ Ver4DictConstants::TIME_STAMP_FIELD_SIZE
+ Ver4DictConstants::WORD_LEVEL_FIELD_SIZE
+ Ver4DictConstants::WORD_COUNT_FIELD_SIZE
+ Ver4DictConstants::BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE;
} else {
return Ver4DictConstants::BIGRAM_FLAGS_FIELD_SIZE
+ Ver4DictConstants::PROBABILITY_SIZE
+ Ver4DictConstants::BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE;
}
}
bool runGCBigramList(const int bigramListPos,
const BigramDictContent *const sourceBigramDictContent, const int toPos,
const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,