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add debug log for malformed PATH payload

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Log path_len and len when the bounds check fails, making it easier to
diagnose malformed or corrupt packets during development.
This commit is contained in:
Wessel Nieboer 2026-02-11 03:41:16 +01:00 • committed by Wessel Nieboer
parent 15cc805c04
commit 5c07b1b02c
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1 changed files with 4 additions and 1 deletions
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5
src/Mesh.cpp
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@ -155,7 +155,10 @@ DispatcherAction Mesh::onRecvPacket(Packet* pkt) {
uint8_t path_len = data[k++];
uint8_t hash_size = (path_len >> 6) + 1;
uint8_t hash_count = path_len & 63;
if (k + hash_size*hash_count + 1 > len) break; // bounds check: need path bytes + extra_type byte
if (k + hash_size*hash_count + 1 > len) { // bounds check: need path bytes + extra_type byte
MESH_DEBUG_PRINTLN("%s Mesh::onRecvPacket(): bad PATH payload format, path_len=%d len=%d", getLogDateTime(), (int)path_len, (int)len);
break;
}
uint8_t* path = &data[k]; k += hash_size*hash_count;
uint8_t extra_type = data[k++] & 0x0F; // upper 4 bits reserved for future use
uint8_t* extra = &data[k];