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qapi: Fix error handling code on alternate conflict

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The conflict check added by commit c0644771 ("qapi: Reject
alternates that can't work with keyval_parse()") doesn't work
with the following declaration:

  { 'alternate': 'Alt',
    'data': { 'one': 'bool',
              'two': 'str' } }

It crashes with:

  Traceback (most recent call last):
    File "./scripts/qapi-types.py", line 295, in <module>
      schema = QAPISchema(input_file)
    File "/home/ehabkost/rh/proj/virt/qemu/scripts/qapi.py", line 1468, in __init__
      self.exprs = check_exprs(parser.exprs)
    File "/home/ehabkost/rh/proj/virt/qemu/scripts/qapi.py", line 958, in check_exprs
      check_alternate(expr, info)
    File "/home/ehabkost/rh/proj/virt/qemu/scripts/qapi.py", line 830, in check_alternate
      % (name, key, types_seen[qtype]))
  KeyError: 'QTYPE_QSTRING'

This happens because the previously-seen conflicting member
('one') can't be found at types_seen[qtype], but at
types_seen['QTYPE_BOOL'].

Fix the bug by moving the error check to the same loop that adds
new items to types_seen, raising an exception if types_seen[qt]
is already set.

Add two additional test cases that can detect the bug.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170717180926.14924-1-ehabkost@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-07-17 15:09:26 -03:00 • committed by Markus Armbruster
parent 223cd0e13f
commit fda72ab451
10 changed files with 18 additions and 4 deletions
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8
scripts/qapi.py
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@ -825,11 +825,11 @@ def check_alternate(expr, info):
else:
conflicting.add('QTYPE_QNUM')
conflicting.add('QTYPE_QBOOL')
if conflicting & set(types_seen):
raise QAPISemError(info, "Alternate '%s' member '%s' can't "
"be distinguished from member '%s'"
% (name, key, types_seen[qtype]))
for qt in conflicting:
if qt in types_seen:
raise QAPISemError(info, "Alternate '%s' member '%s' can't "
"be distinguished from member '%s'"
% (name, key, types_seen[qt]))
types_seen[qt] = key