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[83.42.66.234]) by smtp.gmail.com with ESMTPSA id t11sm16097571wrm.8.2020.11.16.03.43.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Nov 2020 03:43:17 -0800 (PST) Subject: Re: [PATCH v2] json: Fix a memleak in parse_pair() To: Markus Armbruster , "Chenqun (kuhn)" References: <20201113145525.85151-1-alex.chen@huawei.com> <7412CDE03601674DA8197E2EBD8937E83BA6762C@dggemm511-mbs.china.huawei.com> <87eektkdjw.fsf@dusky.pond.sub.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <895daa42-e241-ff9c-6f55-a369ccfe9eb9@redhat.com> Date: Mon, 16 Nov 2020 12:43:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <87eektkdjw.fsf@dusky.pond.sub.org> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/16 04:46:27 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Chenzhendong \(alex\)" , "qemu-trivial@nongnu.org" , Zhanghailiang , "qemu-devel@nongnu.org" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/16/20 7:42 AM, Markus Armbruster wrote: > "Chenqun (kuhn)" writes: > >>> -----Original Message----- >>> From: Chenzhendong (alex) >>> Sent: Friday, November 13, 2020 10:55 PM >>> To: armbru@redhat.com >>> Cc: Chenzhendong (alex) ; qemu-devel@nongnu.org; >>> qemu-trivial@nongnu.org; Zhanghailiang ; >>> Chenqun (kuhn) >>> Subject: [PATCH v2] 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 >>> /Images/source_org/qemu_master/qemu/qobject/qnum.c:25 >>> #3 0xaaab35584d23 in parse_literal >>> /Images/source_org/qemu_master/qemu/qobject/json-parser.c:511 >>> #4 0xaaab35584d23 in parse_value >>> /Images/source_org/qemu_master/qemu/qobject/json-parser.c:554 >>> #5 0xaaab35583d77 in parse_pair >>> /Images/source_org/qemu_master/qemu/qobject/json-parser.c:270 >>> #6 0xaaab355845db in parse_object >>> /Images/source_org/qemu_master/qemu/qobject/json-parser.c:327 >>> #7 0xaaab355845db in parse_value >>> /Images/source_org/qemu_master/qemu/qobject/json-parser.c:546 >>> #8 0xaaab35585b1b in json_parser_parse >>> /Images/source_org/qemu_master/qemu/qobject/json-parser.c:580 >>> #9 0xaaab35583703 in json_message_process_token >>> /Images/source_org/qemu_master/qemu/qobject/json-streamer.c:92 >>> #10 0xaaab355ddccf in json_lexer_feed_char >>> /Images/source_org/qemu_master/qemu/qobject/json-lexer.c:313 >>> #11 0xaaab355de0eb in json_lexer_feed >>> /Images/source_org/qemu_master/qemu/qobject/json-lexer.c:350 >>> #12 0xaaab354aff67 in tcp_chr_read >>> /Images/source_org/qemu_master/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 >>> /Images/source_org/qemu_master/qemu/iothread.c:82 >>> #17 0xaaab3559d71b in qemu_thread_start >>> /Images/source_org/qemu_master/qemu/util/qemu-thread-posix.c:519 >>> ... > > Queued, thanks! If possible can you s%/Images/source_org/qemu_master/qemu/%% to make description more readable...? Thanks, Phil.