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bpo-38708: email: Fix a potential IndexError when parsing Message-ID (GH-17504)

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Fix a potential IndexError when passing an empty value to the message-id
parser. Instead, HeaderParseError should be raised.
This commit is contained in:
Abhilash Raj 2019-12-08 17:37:34 -08:00 • committed by GitHub
parent 68157da8b4
commit 3ae4ea1931
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3 changed files with 8 additions and 1 deletions
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2
Lib/email/_header_value_parser.py
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@ -2047,7 +2047,7 @@ def get_msg_id(value):
no-fold-literal = "[" *dtext "]"
"""
msg_id = MsgID()
if value[0] in CFWS_LEADER:
if value and value[0] in CFWS_LEADER:
token, value = get_cfws(value)
msg_id.append(token)
if not value or value[0] != '<':