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Avoid buffer overflow (issue #444)

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Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Stefan Weil 2020-06-22 22:19:58 +02:00
parent a164ff3728
commit cfabdfe0af
1 changed files with 8 additions and 5 deletions
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13
src/classify/intmatcher.cpp
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@ -890,18 +890,21 @@ int IntegerMatcher::UpdateTablesForFeature(
tables->feature_evidence_[config_offset] = Evidence;
}
uint8_t ProtoIndex =
ClassTemplate->ProtoLengths[ActualProtoNum + proto_offset];
if (ProtoIndex > MAX_PROTO_INDEX) {
// Avoid buffer overflow.
// TODO: A better fix is still open.
ProtoIndex = MAX_PROTO_INDEX;
}
uint8_t* UINT8Pointer =
&(tables->proto_evidence_[ActualProtoNum + proto_offset][0]);
for (uint8_t ProtoIndex =
ClassTemplate->ProtoLengths[ActualProtoNum + proto_offset];
ProtoIndex > 0; ProtoIndex--, UINT8Pointer++) {
for (; Evidence > 0 && ProtoIndex > 0; ProtoIndex--, UINT8Pointer++) {
if (Evidence > *UINT8Pointer) {
uint8_t Temp = *UINT8Pointer;
*UINT8Pointer = Evidence;
Evidence = Temp;
}
else if (Evidence == 0)
break;
}
}
}