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Fuzzer 03 - Mesh: reject PATH payload whose path_len claims more path bytes than the frame actually contains #3269

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Fuzzer 03 - Mesh: reject PATH payload whose path_len claims more path bytes than the frame actually contains #3269

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4 changes: 4 additions & 0 deletions src/Mesh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,10 @@ DispatcherAction Mesh::onRecvPacket(Packet* pkt) {
uint8_t hash_size = (path_len >> 6) + 1;
uint8_t hash_count = path_len & 63;
uint8_t* path = &data[k]; k += hash_size*hash_count;
if (k >= len) {
MESH_DEBUG_PRINTLN("%s PAYLOAD_TYPE_PATH, set path_len %u exceeds amount of available payload %u",
getLogDateTime(), (uint32_t)path_len, (uint32_t)len);
}
uint8_t extra_type = data[k++] & 0x0F; // upper 4 bits reserved for future use
uint8_t* extra = &data[k];
uint8_t extra_len = len - k; // remainder of packet (may be padded with zeroes!)
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