id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
30852	Technical 500 page's ExceptionReporter may crash when given a POST payload with an invalid boundary	Keryn Knight		"Saw this on IRC yesterday, recording it as it's unlikely the user will now do so; I've sanitised the paths referenced in the traceback, but the user was on Windows using Python 3.7 - they were trying to send an AJAX request with a file attachment via FormData, but were getting it wrong...

{{{
  File "".../django/core/handlers/exception.py"", line 34, in inner
    response = get_response(request)
  File "".../django/utils/deprecation.py"", line 94, in __call__
    response = response or self.get_response(request)
  File "".../django/core/handlers/exception.py"", line 36, in inner
    response = response_for_exception(request, exc)
  File "".../django/core/handlers/exception.py"", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "".../django/core/handlers/exception.py"", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "".../django/views/debug.py"", line 94, in technical_500_response
    html = reporter.get_traceback_html()
  File "".../django/views/debug.py"", line 333, in get_traceback_html
    c = Context(self.get_traceback_data(), use_l10n=False)
  File "".../django/views/debug.py"", line 305, in get_traceback_data
    'filtered_POST_items': list(self.filter.get_post_parameters(self.request).items()),
  File "".../django/views/debug.py"", line 177, in get_post_parameters
    return request.POST
  File "".../django/core/handlers/wsgi.py"", line 110, in _get_post
    self._load_post_and_files()
  File "".../django/http/request.py"", line 315, in _load_post_and_files
    self._post, self._files = self.parse_file_upload(self.META, data)
  File "".../django/http/request.py"", line 274, in parse_file_upload
    parser = MultiPartParser(META, post_data, self.upload_handlers, self.encoding)
  File "".../django/http/multipartparser.py"", line 72, in __init__
    raise MultiPartParserError('Invalid boundary in multipart: %s' % boundary.decode())
AttributeError: 'NoneType' object has no attribute 'decode'
}}}

Ultimately, `parse_file_upload` is intended to be allowed to raise `MultiPartParserError` which is then re-raised, but `MultiPartParserError` probably shouldn't be encountered when trying to render the debug page itself, so `get_post_parameters` perhaps ought to handle exceptions which may occur from accessing `request.POST` (for the first time? not sure)
"	Bug	closed	Error reporting	2.2	Normal	duplicate			Unreviewed	0	0	0	0	0	0