[dpdk-dev] [PATCH v2 1/2] telemetry: fix missing check for thread creation

[Min Hu (Connor)]

Hi, David,
	ALl has been fixed in v3, please check it out, thanks.

在 2021/4/12 15:48, David Marchand 写道:
> On Mon, Apr 12, 2021 at 2:32 AM Min Hu (Connor) <humin29 at huawei.com> wrote:
>>
>> From: Chengwen Feng <fengchengwen at huawei.com>
>>
>> Add result check and message print out for thread creation after
>> failure.
> 
> Ah, I was looking at this code too, while looking at your other series :-).
> 
> 
>>
>> Fixes: b80fe1805eee ("telemetry: introduce backward compatibility")
>> Cc: stable at dpdk.org
>>
>> Signed-off-by: Chengwen Feng <fengchengwen at huawei.com>
>> Signed-off-by: Min Hu (Connor) <humin29 at huawei.com>
>> ---
>>   lib/librte_telemetry/telemetry.c        | 28 +++++++++++++++++++++++++---
>>   lib/librte_telemetry/telemetry_legacy.c | 10 ++++++++--
>>   2 files changed, 33 insertions(+), 5 deletions(-)
>>
>> diff --git a/lib/librte_telemetry/telemetry.c b/lib/librte_telemetry/telemetry.c
>> index 7e08afd..3f1a4c4 100644
>> --- a/lib/librte_telemetry/telemetry.c
>> +++ b/lib/librte_telemetry/telemetry.c
>> @@ -350,6 +350,7 @@ socket_listener(void *socket)
>>   {
>>          while (1) {
>>                  pthread_t th;
>> +               int rc;
>>                  struct socket *s = (struct socket *)socket;
>>                  int s_accepted = accept(s->sock, NULL, NULL);
>>                  if (s_accepted < 0) {
>> @@ -366,7 +367,14 @@ socket_listener(void *socket)
>>                          __atomic_add_fetch(s->num_clients, 1,
>>                                          __ATOMIC_RELAXED);
>>                  }
>> -               pthread_create(&th, NULL, s->fn, (void *)(uintptr_t)s_accepted);
>> +               rc = pthread_create(&th, NULL, s->fn,
>> +                                   (void *)(uintptr_t)s_accepted);
>> +               if (rc) {
> 
> Either you use this rc variable (adding strerror(rc) in the log
> message below) or you can remove it.
> This comment applies to others updates below.
> 
> 
>> +                       TMTY_LOG(ERR, "Error with create thread, telemetry thread quitting\n");
>> +                       close(s_accepted);
>> +                       return NULL;
>> +               }
>> +
>>                  pthread_detach(th);
>>          }
>>          return NULL;
>> @@ -425,6 +433,7 @@ static int
>>   telemetry_legacy_init(void)
>>   {
>>          pthread_t t_old;
>> +       int rc;
>>
>>          if (num_legacy_callbacks == 1) {
>>                  TMTY_LOG(WARNING, "No legacy callbacks, legacy socket not created\n");
>> @@ -440,7 +449,13 @@ Fixes: 3b3757bda3c3 ("net/ice: get VF hardware index in DCF")
> (void)
>>          v1_socket.sock = create_socket(v1_socket.path);
>>          if (v1_socket.sock < 0)
>>                  return -1;
>> -       pthread_create(&t_old, NULL, socket_listener, &v1_socket);
>> +       rc = pthread_create(&t_old, NULL, socket_listener, &v1_socket);
>> +       if (rc) {
>> +               TMTY_LOG(ERR, "Error with create thread\n");
>> +               unlink_sockets();
> 
> Before this patch, v2 mode could be working fine with v1 ko.
> I think it was intended since telemetry_legacy_init return value is
> not checked and unlink_sockets() checks whether the v1 and v2 sockets
> have been created.
> 
> Plus, in this error handling, the v1 socket fd is left open.
> 
> How about:
> 
> +       ret = pthread_create(&t_old, NULL, socket_listener, &v1_socket);
> +       if (ret != 0) {
> +               TMTY_LOG(DEBUG, "Failed to create handler for legacy
> socket: %s\n",
> +                       strerror(ret));
> +               close(v1_socket.sock);
> +               v1_socket.sock = -1;
> +               if (v1_socket.path[0]) {
> +                       unlink(v1_socket.path);
> +                       v1_socket.path[0] = '\0';
> +               }
> +               return -1;
> +       }
> 
ok, but there is no need to judge v1_socket.path[0] because previous
setup will ensure it's validation.
> 
>> +               return -1;
>> +       }
>> +
>>          pthread_setaffinity_np(t_old, sizeof(*thread_cpuset), thread_cpuset);
>>
>>          TMTY_LOG(DEBUG, "Legacy telemetry socket initialized ok\n");
>> @@ -451,6 +466,7 @@ static int
>>   telemetry_v2_init(void)
>>   {
>>          pthread_t t_new;
>> +       int rc;
>>
>>          v2_socket.num_clients = &v2_clients;
>>          rte_telemetry_register_cmd("/", list_commands,
>> @@ -469,7 +485,13 @@ telemetry_v2_init(void)
>>          v2_socket.sock = create_socket(v2_socket.path);
>>          if (v2_socket.sock < 0)
>>                  return -1;
>> -       pthread_create(&t_new, NULL, socket_listener, &v2_socket);
>> +       rc = pthread_create(&t_new, NULL, socket_listener, &v2_socket);
>> +       if (rc) {
>> +               TMTY_LOG(ERR, "Error with create thread\n");
>> +               unlink_sockets();
>> +               return -1;
>> +       }
>> +
> 
> Missing a close on v2 socket,
> 
> 
>>          pthread_setaffinity_np(t_new, sizeof(*thread_cpuset), thread_cpuset);
>>          atexit(unlink_sockets);
>>
>> diff --git a/lib/librte_telemetry/telemetry_legacy.c b/lib/librte_telemetry/telemetry_legacy.c
>> index 5e9af37..9587bfe 100644
>> --- a/lib/librte_telemetry/telemetry_legacy.c
>> +++ b/lib/librte_telemetry/telemetry_legacy.c
>> @@ -83,6 +83,7 @@ register_client(const char *cmd __rte_unused, const char *params,
>>          pthread_t th;
>>          char data[BUF_SIZE];
>>          int fd;
>> +       int rc;
>>          struct sockaddr_un addrs;
>>   #endif /* !RTE_EXEC_ENV_WINDOWS */
>>
>> @@ -112,8 +113,13 @@ register_client(const char *cmd __rte_unused, const char *params,
>>                  close(fd);
>>                  return -1;
>>          }
>> -       pthread_create(&th, NULL, &legacy_client_handler,
>> -                       (void *)(uintptr_t)fd);
>> +       rc = pthread_create(&th, NULL, &legacy_client_handler,
>> +                               (void *)(uintptr_t)fd);
>> +       if (rc) {
>> +               fprintf(stderr, "Failed to create thread\n");
>> +               close(fd);
>> +               return -1;
>> +       }
>>   #endif /* !RTE_EXEC_ENV_WINDOWS */
>>          return 0;
>>   }
>> --
>> 2.7.4
>>
> 
> 
>