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authorMarkus Armbruster <armbru@redhat.com>2018-08-23 18:40:14 +0200
committerMarkus Armbruster <armbru@redhat.com>2018-08-24 20:26:37 +0200
commitdd98e8481992741a6b5ec0bdfcee05c1c8f602d6 (patch)
tree8d75ba8eb3fa29da29bb243efff2fc65488add72 /qobject
parent5d50113cf675ec96337ac6eaf81d83fbf69273bc (diff)
qjson: Have qobject_from_json() & friends reject empty and blank
The last case where qobject_from_json() & friends return null without setting an error is empty or blank input. Callers: * block.c's parse_json_protocol() reports "Could not parse the JSON options". It's marked as a work-around, because it also covered actual bugs, but they got fixed in the previous few commits. * qobject_input_visitor_new_str() reports "JSON parse error". Also marked as work-around. The recent fixes have made this unreachable, because it currently gets called only for input starting with '{'. * check-qjson.c's empty_input() and blank_input() demonstrate the behavior. * The other callers are not affected since they only pass input with exactly one JSON value or, in the case of negative tests, one error. Fail with "Expecting a JSON value" instead of returning null, and simplify callers. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-48-armbru@redhat.com>
Diffstat (limited to 'qobject')
-rw-r--r--qobject/qjson.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/qobject/qjson.c b/qobject/qjson.c
index 7f69036487..b9ccae2c2a 100644
--- a/qobject/qjson.c
+++ b/qobject/qjson.c
@@ -70,6 +70,10 @@ static QObject *qobject_from_jsonv(const char *string, va_list *ap,
json_message_parser_flush(&state.parser);
json_message_parser_destroy(&state.parser);
+ if (!state.result && !state.err) {
+ error_setg(&state.err, "Expecting a JSON value");
+ }
+
error_propagate(errp, state.err);
return state.result;
}