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guard against heap-overflow in the event of bogus entity network data

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This commit is contained in:
Seth Alves 2016-11-03 06:54:11 -07:00
parent 64cb5d1b1a
commit cfea3cba9b
1 changed files with 16 additions and 0 deletions
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16
libraries/octree/src/OctreePacketData.cpp
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@ -686,6 +686,10 @@ int OctreePacketData::unpackDataFromBytes(const unsigned char *dataBytes, QVecto
uint16_t length; uint16_t length;
memcpy(&length, dataBytes, sizeof(uint16_t)); memcpy(&length, dataBytes, sizeof(uint16_t));
dataBytes += sizeof(length); dataBytes += sizeof(length);
if (length * sizeof(glm::vec3) > MAX_OCTREE_UNCOMRESSED_PACKET_SIZE) {
result.resize(0);
return sizeof(uint16_t);
}
result.resize(length); result.resize(length);
memcpy(result.data(), dataBytes, length * sizeof(glm::vec3)); memcpy(result.data(), dataBytes, length * sizeof(glm::vec3));
return sizeof(uint16_t) + length * sizeof(glm::vec3); return sizeof(uint16_t) + length * sizeof(glm::vec3);
@ -695,6 +699,10 @@ int OctreePacketData::unpackDataFromBytes(const unsigned char *dataBytes, QVecto
uint16_t length; uint16_t length;
memcpy(&length, dataBytes, sizeof(uint16_t)); memcpy(&length, dataBytes, sizeof(uint16_t));
dataBytes += sizeof(length); dataBytes += sizeof(length);
if (length * sizeof(glm::quat) > MAX_OCTREE_UNCOMRESSED_PACKET_SIZE) {
result.resize(0);
return sizeof(uint16_t);
}
result.resize(length); result.resize(length);
const unsigned char *start = dataBytes; const unsigned char *start = dataBytes;
@ -709,6 +717,10 @@ int OctreePacketData::unpackDataFromBytes(const unsigned char* dataBytes, QVecto
uint16_t length; uint16_t length;
memcpy(&length, dataBytes, sizeof(uint16_t)); memcpy(&length, dataBytes, sizeof(uint16_t));
dataBytes += sizeof(length); dataBytes += sizeof(length);
if (length * sizeof(float) > MAX_OCTREE_UNCOMRESSED_PACKET_SIZE) {
result.resize(0);
return sizeof(uint16_t);
}
result.resize(length); result.resize(length);
memcpy(result.data(), dataBytes, length * sizeof(float)); memcpy(result.data(), dataBytes, length * sizeof(float));
return sizeof(uint16_t) + length * sizeof(float); return sizeof(uint16_t) + length * sizeof(float);
@ -718,6 +730,10 @@ int OctreePacketData::unpackDataFromBytes(const unsigned char* dataBytes, QVecto
uint16_t length; uint16_t length;
memcpy(&length, dataBytes, sizeof(uint16_t)); memcpy(&length, dataBytes, sizeof(uint16_t));
dataBytes += sizeof(length); dataBytes += sizeof(length);
if (length * sizeof(bool) > MAX_OCTREE_UNCOMRESSED_PACKET_SIZE) {
result.resize(0);
return sizeof(uint16_t);
}
result.resize(length); result.resize(length);
int bit = 0; int bit = 0;