diff options
| author | Markus Armbruster <armbru@redhat.com> | 2015-11-25 22:23:23 +0100 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2015-11-26 09:18:04 +0100 |
| commit | 0753113a26bb8c77f951b1ea91fd4f36d099c37a (patch) | |
| tree | 3b487f57d8f3fb14e322154efb89bd57bc4fca67 | |
| parent | 4f2d31fbc0bfdf41feea7d1be49f4f7ffa005534 (diff) | |
qjson: Don't crash when input exceeds nesting limit
We limit nesting depth and input size to defend against input
triggering excessive heap or stack memory use (commit 29c75dd
json-streamer: limit the maximum recursion depth and maximum token
count). However, when the nesting limit is exceeded,
parser_context_peek_token()'s assertion fails.
Broken in commit 65c0f1e "json-parser: don't replicate tokens at each
level of recursion".
To reproduce stuff 1025 open braces or brackets into QMP.
Fix by taking the error exit instead of the normal one.
Reported-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1448486613-17634-3-git-send-email-armbru@redhat.com>
| -rw-r--r-- | qobject/json-streamer.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/qobject/json-streamer.c b/qobject/json-streamer.c index dced2c77a1..2bd22a738e 100644 --- a/qobject/json-streamer.c +++ b/qobject/json-streamer.c @@ -68,13 +68,14 @@ static void json_message_process_token(JSONLexer *lexer, QString *token, JSONTok /* Security consideration, we limit total memory allocated per object * and the maximum recursion depth that a message can force. */ - goto out_emit; + goto out_emit_bad; } return; out_emit_bad: - /* clear out token list and tell the parser to emit and error + /* + * Clear out token list and tell the parser to emit an error * indication by passing it a NULL list */ QDECREF(parser->tokens); |