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json-streamer: fix double-free on exiting during a parse

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Now that json-streamer tries not to leak tokens on incomplete parse,
the tokens can be freed twice if QEMU destroys the json-streamer
object during the parser->emit call.  To fix this, create the new
empty GQueue earlier, so that it is already in place when the old
one is passed to parser->emit.

Reported-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1467636059-12557-1-git-send-email-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-07-04 14:40:59 +02:00
parent 28ba61e7ff
commit a942d8fa01
1 changed files with 6 additions and 2 deletions
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8
qobject/json-streamer.c
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@ -39,6 +39,7 @@ static void json_message_process_token(JSONLexer *lexer, GString *input,
{
JSONMessageParser *parser = container_of(lexer, JSONMessageParser, lexer);
JSONToken *token;
GQueue *tokens;
switch (type) {
case JSON_LCURLY:
@ -96,9 +97,12 @@ out_emit:
/* send current list of tokens to parser and reset tokenizer */
parser->brace_count = 0;
parser->bracket_count = 0;
/* parser->emit takes ownership of parser->tokens. */
parser->emit(parser, parser->tokens);
/* parser->emit takes ownership of parser->tokens. Remove our own
* reference to parser->tokens before handing it out to parser->emit.
*/
tokens = parser->tokens;
parser->tokens = g_queue_new();
parser->emit(parser, tokens);
parser->token_size = 0;
}