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qapi/expr.py: Check type of union and alternate 'data' member

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Prior to this commit, specifying a non-object value here causes the QAPI
parser to crash in expr.py with a stack trace with (likely) an
AttributeError when we attempt to call that value's items() method.

This member needs to be an object (Dict), and not anything else. Add a
check for this with a nicer error message, and formalize that check with
new test cases that exercise that error.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210421182032.3521476-8-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
John Snow 2021-04-21 14:20:22 -04:00 • committed by Markus Armbruster
parent 926bb8add7
commit 4918bb7def
8 changed files with 23 additions and 0 deletions
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7
scripts/qapi/expr.py
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@ -283,6 +283,9 @@ def check_union(expr, info):
raise QAPISemError(info, "'discriminator' requires 'base'")
check_name_is_str(discriminator, info, "'discriminator'")
if not isinstance(members, dict):
raise QAPISemError(info, "'data' must be an object")
for (key, value) in members.items():
source = "'data' member '%s'" % key
if discriminator is None:
@ -298,6 +301,10 @@ def check_alternate(expr, info):
if not members:
raise QAPISemError(info, "'data' must not be empty")
if not isinstance(members, dict):
raise QAPISemError(info, "'data' must be an object")
for (key, value) in members.items():
source = "'data' member '%s'" % key
check_name_lower(key, info, source)