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From a781053c1b5084ba32b86229b98b9601c990722c Mon Sep 17 00:00:00 2001
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From: Markus Armbruster <armbru@redhat.com>
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Date: Wed, 27 Jul 2016 07:35:13 +0200
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Subject: [PATCH 15/16] json-streamer: fix double-free on exiting during a
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parse
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RH-Author: Markus Armbruster <armbru@redhat.com>
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Message-id: <1469604913-12442-17-git-send-email-armbru@redhat.com>
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Patchwork-id: 71484
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O-Subject: [RHEL-7.3 qemu-kvm PATCH v2 15/15] json-streamer: fix double-free on exiting during a parse
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Bugzilla: 1276036
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Now that json-streamer tries not to leak tokens on incomplete parse,
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the tokens can be freed twice if QEMU destroys the json-streamer
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object during the parser->emit call. To fix this, create the new
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empty GQueue earlier, so that it is already in place when the old
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one is passed to parser->emit.
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Reported-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Message-Id: <1467636059-12557-1-git-send-email-pbonzini@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit a942d8fa01f65279cdc135f4294db611bbc088ef)
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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qobject/json-streamer.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/qobject/json-streamer.c b/qobject/json-streamer.c
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index 3c7d6be..7d041e1 100644
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--- a/qobject/json-streamer.c
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+++ b/qobject/json-streamer.c
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@@ -38,6 +38,7 @@ static void json_message_process_token(JSONLexer *lexer, GString *input,
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{
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JSONMessageParser *parser = container_of(lexer, JSONMessageParser, lexer);
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JSONToken *token;
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+ GQueue *tokens;
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switch (type) {
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case JSON_LCURLY:
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@@ -95,9 +96,12 @@ out_emit:
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/* send current list of tokens to parser and reset tokenizer */
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parser->brace_count = 0;
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parser->bracket_count = 0;
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- /* parser->emit takes ownership of parser->tokens. */
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- parser->emit(parser, parser->tokens);
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+ /* parser->emit takes ownership of parser->tokens. Remove our own
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+ * reference to parser->tokens before handing it out to parser->emit.
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+ */
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+ tokens = parser->tokens;
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parser->tokens = g_queue_new();
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+ parser->emit(parser, tokens);
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parser->token_size = 0;
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}
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--
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1.8.3.1
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