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Fix out-of-bounds read in TRACE packet hash matching #1655

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Fix out-of-bounds read in TRACE packet hash matching #1655

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3 changes: 2 additions & 1 deletion src/Mesh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -56,9 +56,10 @@ DispatcherAction Mesh::onRecvPacket(Packet* pkt) {

uint8_t len = pkt->payload_len - i;
uint8_t offset = pkt->path_len << path_sz;
uint8_t hash_sz = 1 << path_sz;
if (offset >= len) { // TRACE has reached end of given path
onTraceRecv(pkt, trace_tag, auth_code, flags, pkt->path, &pkt->payload[i], len);
} else if (self_id.isHashMatch(&pkt->payload[i + offset], 1 << path_sz) && allowPacketForward(pkt) && !_tables->hasSeen(pkt)) {
} else if (offset + hash_sz <= len && self_id.isHashMatch(&pkt->payload[i + offset], hash_sz) && allowPacketForward(pkt) && !_tables->hasSeen(pkt)) {
// append SNR (Not hash!)
pkt->path[pkt->path_len++] = (int8_t) (pkt->getSNR()*4);

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