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[3.13] gh-77057: Fix handling of invalid markup declarations in HTMLParser (GH-9295) (GH-133834)

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(cherry picked from commit 76c0b01bc4)

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2025-05-10 16:55:12 +02:00 • committed by GitHub
parent 3de6546381
commit aa0c3d1098
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3 changed files with 68 additions and 19 deletions
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Lib/html/parser.py
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@ -278,7 +278,7 @@ class HTMLParser(_markupbase.ParserBase):
if rawdata[i:i+4] == '<!--':
# this case is actually already handled in goahead()
return self.parse_comment(i)
elif rawdata[i:i+3] == '<![':
elif rawdata[i:i+9] == '<![CDATA[':
return self.parse_marked_section(i)
elif rawdata[i:i+9].lower() == '<!doctype':
# find the closing >
@ -295,7 +295,7 @@ class HTMLParser(_markupbase.ParserBase):
def parse_bogus_comment(self, i, report=1):
rawdata = self.rawdata
assert rawdata[i:i+2] in ('<!', '</'), ('unexpected call to '
'parse_comment()')
'parse_bogus_comment()')
pos = rawdata.find('>', i+2)
if pos == -1:
return -1