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Fri, 8 Jul 2022 09:28:22 +0000 Message-ID: <478cac62-6c6f-68b1-b424-14f3139089d8@intel.com> Date: Fri, 8 Jul 2022 10:28:17 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH v3] examples/vm_power_manager: use safe version of list iterator Content-Language: en-US To: Hamza Khan , CC: , References: <20220601105455.166505-1-hamza.khan@intel.com> <20220708085141.925246-1-hamza.khan@intel.com> From: "Hunt, David" In-Reply-To: <20220708085141.925246-1-hamza.khan@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: LO4P265CA0214.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:33a::9) To BYAPR11MB3799.namprd11.prod.outlook.com (2603:10b6:a03:fb::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2b2c1e02-d87c-40d3-9c08-08da60c4338f X-MS-TrafficTypeDiagnostic: BYAPR11MB3800:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This > leads to use-after-free error. To address this, replace all usages of > LIST_* with TAILQ_* macros, and use the RTE_TAILQ_FOREACH_SAFE macro > to iterate and delete VM info structures. > > * The change is small and doesn’t affect other code > * Testing was performed on the patch > > Fixes: e8ae9b662506 ("examples/vm_power: channel manager and monitor in host") > Cc: alan.carew@intel.com > Cc: stable@dpdk.org > > Signed-off-by: Hamza Khan > > --- > V3: Update commit message > V2: Use RTE_TAILQ_* marcos > --- > examples/vm_power_manager/channel_manager.c | 20 +++++++++++--------- > 1 file changed, 11 insertions(+), 9 deletions(-) > > diff --git a/examples/vm_power_manager/channel_manager.c b/examples/vm_power_manager/channel_manager.c > index 838465ab4b..e82c26ddca 100644 > --- a/examples/vm_power_manager/channel_manager.c > +++ b/examples/vm_power_manager/channel_manager.c > @@ -29,6 +29,8 @@ > #include "channel_monitor.h" > #include "power_manager.h" > > +#include "rte_tailq.h" > + > > #define RTE_LOGTYPE_CHANNEL_MANAGER RTE_LOGTYPE_USER1 > > @@ -58,16 +60,16 @@ struct virtual_machine_info { > virDomainInfo info; > rte_spinlock_t config_spinlock; > int allow_query; > - LIST_ENTRY(virtual_machine_info) vms_info; > + RTE_TAILQ_ENTRY(virtual_machine_info) vms_info; > }; > > -LIST_HEAD(, virtual_machine_info) vm_list_head; > +RTE_TAILQ_HEAD(, virtual_machine_info) vm_list_head; > > static struct virtual_machine_info * > find_domain_by_name(const char *name) > { > struct virtual_machine_info *info; > - LIST_FOREACH(info, &vm_list_head, vms_info) { > + RTE_TAILQ_FOREACH(info, &vm_list_head, vms_info) { > if (!strncmp(info->name, name, CHANNEL_MGR_MAX_NAME_LEN-1)) > return info; > } > @@ -878,7 +880,7 @@ add_vm(const char *vm_name) > > new_domain->allow_query = 0; > rte_spinlock_init(&(new_domain->config_spinlock)); > - LIST_INSERT_HEAD(&vm_list_head, new_domain, vms_info); > + TAILQ_INSERT_HEAD(&vm_list_head, new_domain, vms_info); > return 0; > } > > @@ -900,7 +902,7 @@ remove_vm(const char *vm_name) > rte_spinlock_unlock(&vm_info->config_spinlock); > return -1; > } > - LIST_REMOVE(vm_info, vms_info); > + TAILQ_REMOVE(&vm_list_head, vm_info, vms_info); > rte_spinlock_unlock(&vm_info->config_spinlock); > rte_free(vm_info); > return 0; > @@ -953,7 +955,7 @@ channel_manager_init(const char *path __rte_unused) > { > virNodeInfo info; > > - LIST_INIT(&vm_list_head); > + TAILQ_INIT(&vm_list_head); > if (connect_hypervisor(path) < 0) { > global_n_host_cpus = 64; > global_hypervisor_available = 0; > @@ -1005,9 +1007,9 @@ channel_manager_exit(void) > { > unsigned i; > char mask[RTE_MAX_LCORE]; > - struct virtual_machine_info *vm_info; > + struct virtual_machine_info *vm_info, *tmp; > > - LIST_FOREACH(vm_info, &vm_list_head, vms_info) { > + RTE_TAILQ_FOREACH_SAFE(vm_info, &vm_list_head, vms_info, tmp) { > > rte_spinlock_lock(&(vm_info->config_spinlock)); > > @@ -1022,7 +1024,7 @@ channel_manager_exit(void) > } > rte_spinlock_unlock(&(vm_info->config_spinlock)); > > - LIST_REMOVE(vm_info, vms_info); > + TAILQ_REMOVE(&vm_list_head, vm_info, vms_info); > rte_free(vm_info); > } > Acked-by: David Hunt