blob: 8fa9f69cc80a0f57703cfd0338ea260e894ed59c (
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diff --git a/scapy/contrib/cdp.py b/scapy/contrib/cdp.py
index a1532b78..83963ff4 100644
--- a/scapy/contrib/cdp.py
+++ b/scapy/contrib/cdp.py
@@ -392,7 +392,7 @@ class _CDPChecksum:
This padding is only used for checksum computation. The original
packet should not be altered."""
if len(pkt) % 2:
- last_chr = orb(pkt[-1])
+ last_chr = orb(pkt[len(pkt)-1:])
if last_chr <= 0x80:
return pkt[:-1] + b'\x00' + chb(last_chr)
else:
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