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| author | Alex Chen <alex.chen@huawei.com> | 2020-11-13 14:55:25 +0000 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2020-11-17 15:39:53 +0100 |
| commit | 922d42bb0d08c154602dd9112da00d22d2b46579 (patch) | |
| tree | bbebafc4133fb2d7c741237c966ccbee83b10867 /qobject/json-parser.c | |
| parent | 1c7ab0930a3e02e6e54722c20b6b586364f387a7 (diff) | |
| download | qemu-922d42bb0d08c154602dd9112da00d22d2b46579.zip qemu-922d42bb0d08c154602dd9112da00d22d2b46579.tar.gz qemu-922d42bb0d08c154602dd9112da00d22d2b46579.tar.bz2 | |
json: Fix a memleak in parse_pair()
In qobject_type(), NULL is returned when the 'QObject' returned from parse_value() is not of QString type,
and this 'QObject' memory will leaked.
So we need to first cache the 'QObject' returned from parse_value(), and finally
free 'QObject' memory at the end of the function.
Also, we add a testcast about invalid dict key.
The memleak stack is as follows:
Direct leak of 32 byte(s) in 1 object(s) allocated from:
#0 0xfffe4b3c34fb in __interceptor_malloc (/lib64/libasan.so.4+0xd34fb)
#1 0xfffe4ae48aa3 in g_malloc (/lib64/libglib-2.0.so.0+0x58aa3)
#2 0xaaab3557d9f7 in qnum_from_int qemu/qobject/qnum.c:25
#3 0xaaab35584d23 in parse_literal qemu/qobject/json-parser.c:511
#4 0xaaab35584d23 in parse_value qemu/qobject/json-parser.c:554
#5 0xaaab35583d77 in parse_pair qemu/qobject/json-parser.c:270
#6 0xaaab355845db in parse_object qemu/qobject/json-parser.c:327
#7 0xaaab355845db in parse_value qemu/qobject/json-parser.c:546
#8 0xaaab35585b1b in json_parser_parse qemu/qobject/json-parser.c:580
#9 0xaaab35583703 in json_message_process_token qemu/qobject/json-streamer.c:92
#10 0xaaab355ddccf in json_lexer_feed_char qemu/qobject/json-lexer.c:313
#11 0xaaab355de0eb in json_lexer_feed qemu/qobject/json-lexer.c:350
#12 0xaaab354aff67 in tcp_chr_read qemu/chardev/char-socket.c:525
#13 0xfffe4ae429db in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x529db)
#14 0xfffe4ae42d8f (/lib64/libglib-2.0.so.0+0x52d8f)
#15 0xfffe4ae430df in g_main_loop_run (/lib64/libglib-2.0.so.0+0x530df)
#16 0xaaab34d70bff in iothread_run qemu/iothread.c:82
#17 0xaaab3559d71b in qemu_thread_start qemu/util/qemu-thread-posix.c:519
Fixes: 532fb5328473 ("qapi: Make more of qobject_to()")
Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Alex Chen <alex.chen@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201113145525.85151-1-alex.chen@huawei.com>
[Commit message tweaked]
Diffstat (limited to 'qobject/json-parser.c')
| -rw-r--r-- | qobject/json-parser.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/qobject/json-parser.c b/qobject/json-parser.c index d083810..c0f521b 100644 --- a/qobject/json-parser.c +++ b/qobject/json-parser.c @@ -257,8 +257,9 @@ static JSONToken *parser_context_peek_token(JSONParserContext *ctxt) */ static int parse_pair(JSONParserContext *ctxt, QDict *dict) { + QObject *key_obj = NULL; + QString *key; QObject *value; - QString *key = NULL; JSONToken *peek, *token; peek = parser_context_peek_token(ctxt); @@ -267,7 +268,8 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict) goto out; } - key = qobject_to(QString, parse_value(ctxt)); + key_obj = parse_value(ctxt); + key = qobject_to(QString, key_obj); if (!key) { parse_error(ctxt, peek, "key is not a string in object"); goto out; @@ -297,13 +299,11 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict) qdict_put_obj(dict, qstring_get_str(key), value); - qobject_unref(key); - + qobject_unref(key_obj); return 0; out: - qobject_unref(key); - + qobject_unref(key_obj); return -1; } |