Re: [PATCH BlueZ] tools/hcitool: Fix memory leak before exit

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Hi Atul,

On Thu, Aug 13, 2015 at 8:28 AM, Atul Rai <a.rai@xxxxxxxxxxx> wrote:
> ping

You seems to be fowarding the email instead if pinging the original
one causing the email to not be threaded properly by email clients.

>> ------- Original Message -------
>> Sender : Atul Kumar Rai<a.rai@xxxxxxxxxxx> Lead Engineer (1)/SRI-Delhi-SWC Group/Samsung Electronics
>> Date : Aug 04, 2015 11:29 (GMT+05:30)
>> Title : [PATCH BlueZ] tools/hcitool: Fix memory leak before exit
>
>> In case of failure, before exiting, free dynamically allocated
>> memory as well as remove reference to opened device.
>> ---
>>  tools/hcitool.c | 226 +++++++++++++++++++++++++++++++++++++++++++-------------
>>  1 file changed, 174 insertions(+), 52 deletions(-)
>>
>> diff --git a/tools/hcitool.c b/tools/hcitool.c
>> index 02c4ebe..a420e4d 100644
>> --- a/tools/hcitool.c
>> +++ b/tools/hcitool.c
>> @@ -166,7 +166,7 @@ static int conn_list(int s, int dev_id, long arg)
>>
>>       if (ioctl(s, HCIGETCONNLIST, (void *) cl)) {
>>               perror("Can't get connection list");
>> -             exit(1);
>> +             goto failure;

This is useless, all file descriptors are closed by the kernel when
the process exit which is the reason why I did not bother with these
in the patches I've sent yesterday. I suppose most static analyzers
should be smart about this, but apparently they are not, anyway in
case there is not a call direct exit in the scope of the function we
might have to fix them even though it is still a false positive it is
much harder for static analyzers to detect them.

>>       }
>>
>>       for (i = 0; i < cl->conn_num; i++, ci++) {
>> @@ -182,6 +182,10 @@ static int conn_list(int s, int dev_id, long arg)
>>
>>       free(cl);
>>       return 0;
>> +
>> +failure:
>> +     free(cl);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static int find_conn(int s, int dev_id, long arg)
>> @@ -200,7 +204,7 @@ static int find_conn(int s, int dev_id, long arg)
>>
>>       if (ioctl(s, HCIGETCONNLIST, (void *) cl)) {
>>               perror("Can't get connection list");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       for (i = 0; i < cl->conn_num; i++, ci++)
>> @@ -211,6 +215,10 @@ static int find_conn(int s, int dev_id, long arg)
>>
>>       free(cl);
>>       return 0;
>> +
>> +failure:
>> +     free(cl);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static void hex_dump(char *pref, int width, unsigned char *buf, int len)
>> @@ -1325,14 +1333,14 @@ static void cmd_dc(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_disconnect(dd, htobs(cr->conn_info->handle),
>> @@ -1342,6 +1350,13 @@ static void cmd_dc(int dev_id, int argc, char **argv)
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Role switch */
>> @@ -1399,10 +1414,15 @@ static void cmd_sr(int dev_id, int argc, char **argv)
>>
>>       if (hci_switch_role(dd, &bdaddr, role, 10000) < 0) {
>>               perror("Switch role request failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       hci_close_dev(dd);
>> +     return;
>> +
>> +failure:
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Read RSSI */
>> @@ -1451,19 +1471,19 @@ static void cmd_rssi(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_read_rssi(dd, htobs(cr->conn_info->handle), &rssi, 1000) < 0) {
>>               perror("Read RSSI failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("RSSI return value: %d\n", rssi);
>> @@ -1471,6 +1491,13 @@ static void cmd_rssi(int dev_id, int argc, char **argv)
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Get link quality */
>> @@ -1519,19 +1546,19 @@ static void cmd_lq(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_read_link_quality(dd, htobs(cr->conn_info->handle), &lq, 1000) < 0) {
>>               perror("HCI read_link_quality request failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("Link quality: %d\n", lq);
>> @@ -1539,6 +1566,13 @@ static void cmd_lq(int dev_id, int argc, char **argv)
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Get transmit power level */
>> @@ -1589,19 +1623,19 @@ static void cmd_tpl(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_read_transmit_power_level(dd, htobs(cr->conn_info->handle), type, &level, 1000) < 0) {
>>               perror("HCI read transmit power level request failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("%s transmit power level: %d\n",
>> @@ -1610,6 +1644,13 @@ static void cmd_tpl(int dev_id, int argc, char **argv)
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Get AFH channel map */
>> @@ -1659,21 +1700,21 @@ static void cmd_afh(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       handle = htobs(cr->conn_info->handle);
>>
>>       if (hci_read_afh_map(dd, handle, &mode, map, 1000) < 0) {
>>               perror("HCI read AFH map request failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (mode == 0x01) {
>> @@ -1688,6 +1729,13 @@ static void cmd_afh(int dev_id, int argc, char **argv)
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Set connection packet type */
>> @@ -1740,14 +1788,14 @@ static void cmd_cpt(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       cp.handle   = htobs(cr->conn_info->handle);
>> @@ -1764,12 +1812,19 @@ static void cmd_cpt(int dev_id, int argc, char **argv)
>>
>>       if (hci_send_req(dd, &rq, 100) < 0) {
>>               perror("Packet type change failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Get/Set link policy settings */
>> @@ -1818,14 +1873,14 @@ static void cmd_lp(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (argc == 1) {
>> @@ -1833,7 +1888,7 @@ static void cmd_lp(int dev_id, int argc, char **argv)
>>               if (hci_read_link_policy(dd, htobs(cr->conn_info->handle),
>>                                                       &policy, 1000) < 0) {
>>                       perror("HCI read_link_policy_settings request failed");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>
>>               policy = btohs(policy);
>> @@ -1843,26 +1898,33 @@ static void cmd_lp(int dev_id, int argc, char **argv)
>>                       bt_free(str);
>>               } else {
>>                       fprintf(stderr, "Invalig settings\n");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>       } else {
>>               unsigned int val;
>>               if (hci_strtolp(argv[1], &val) < 0) {
>>                       fprintf(stderr, "Invalig arguments\n");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>               policy = val;
>>
>>               if (hci_write_link_policy(dd, htobs(cr->conn_info->handle),
>>                                               htobs(policy), 1000) < 0) {
>>                       perror("HCI write_link_policy_settings request failed");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>       }
>>
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Get/Set link supervision timeout */
>> @@ -1911,21 +1973,21 @@ static void cmd_lst(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (argc == 1) {
>>               if (hci_read_link_supervision_timeout(dd, htobs(cr->conn_info->handle),
>>                                                       &timeout, 1000) < 0) {
>>                       perror("HCI read_link_supervision_timeout request failed");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>
>>               timeout = btohs(timeout);
>> @@ -1941,13 +2003,20 @@ static void cmd_lst(int dev_id, int argc, char **argv)
>>               if (hci_write_link_supervision_timeout(dd, htobs(cr->conn_info->handle),
>>                                                       htobs(timeout), 1000) < 0) {
>>                       perror("HCI write_link_supervision_timeout request failed");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>       }
>>
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Request authentication */
>> @@ -1995,24 +2064,31 @@ static void cmd_auth(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_authenticate_link(dd, htobs(cr->conn_info->handle), 25000) < 0) {
>>               perror("HCI authentication request failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Activate encryption */
>> @@ -2061,26 +2137,33 @@ static void cmd_enc(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       encrypt = (argc > 1) ? atoi(argv[1]) : 1;
>>
>>       if (hci_encrypt_link(dd, htobs(cr->conn_info->handle), encrypt, 25000) < 0) {
>>               perror("HCI set encryption request failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Change connection link key */
>> @@ -2128,24 +2211,31 @@ static void cmd_key(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_change_link_key(dd, htobs(cr->conn_info->handle), 25000) < 0) {
>>               perror("Changing link key failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Read clock offset */
>> @@ -2194,19 +2284,19 @@ static void cmd_clkoff(int dev_id, int argc, char **argv)
>>       cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>       if (!cr) {
>>               perror("Can't allocate memory");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       bacpy(&cr->bdaddr, &bdaddr);
>>       cr->type = ACL_LINK;
>>       if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>               perror("Get connection info failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       if (hci_read_clock_offset(dd, htobs(cr->conn_info->handle), &offset, 1000) < 0) {
>>               perror("Reading clock offset failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("Clock offset: 0x%4.4x\n", btohs(offset));
>> @@ -2214,6 +2304,13 @@ static void cmd_clkoff(int dev_id, int argc, char **argv)
>>       free(cr);
>>
>>       hci_close_dev(dd);
>> +
>> +     return;
>> +
>> +failure:
>> +     free(cr);
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  /* Read clock */
>> @@ -2271,7 +2368,7 @@ static void cmd_clock(int dev_id, int argc, char **argv)
>>               cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
>>               if (!cr) {
>>                       perror("Can't allocate memory");
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>
>>               bacpy(&cr->bdaddr, &bdaddr);
>> @@ -2279,7 +2376,7 @@ static void cmd_clock(int dev_id, int argc, char **argv)
>>               if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
>>                       perror("Get connection info failed");
>>                       free(cr);
>> -                     exit(1);
>> +                     goto failure;
>>               }
>>
>>               handle = htobs(cr->conn_info->handle);
>> @@ -2293,7 +2390,7 @@ static void cmd_clock(int dev_id, int argc, char **argv)
>>
>>       if (hci_read_clock(dd, handle, which, &clock, &accuracy, 1000) < 0) {
>>               perror("Reading clock failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       accuracy = btohs(accuracy);
>> @@ -2302,6 +2399,11 @@ static void cmd_clock(int dev_id, int argc, char **argv)
>>       printf("Accuracy: %.2f msec\n", (float) accuracy * 0.3125);
>>
>>       hci_close_dev(dd);
>> +     return;
>> +
>> +failure:
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static int read_flags(uint8_t *flags, const uint8_t *data, size_t size)
>> @@ -2559,13 +2661,13 @@ static void cmd_lescan(int dev_id, int argc, char **argv)
>>                                               own_type, filter_policy, 10000);
>>       if (err < 0) {
>>               perror("Set scan parameters failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       err = hci_le_set_scan_enable(dd, 0x01, filter_dup, 10000);
>>       if (err < 0) {
>>               perror("Enable scan failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("LE Scan ...\n");
>> @@ -2573,16 +2675,21 @@ static void cmd_lescan(int dev_id, int argc, char **argv)
>>       err = print_advertising_devices(dd, filter_type);
>>       if (err < 0) {
>>               perror("Could not receive advertising events");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       err = hci_le_set_scan_enable(dd, 0x00, filter_dup, 10000);
>>       if (err < 0) {
>>               perror("Disable scan failed");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       hci_close_dev(dd);
>> +     return;
>> +
>> +failure:
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static struct option leinfo_options[] = {
>> @@ -2654,7 +2761,7 @@ static void cmd_leinfo(int dev_id, int argc, char **argv)
>>                       min_ce_length, max_ce_length, &handle, 25000);
>>       if (err < 0) {
>>               perror("Could not create connection");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("\tHandle: %d (0x%04x)\n", handle, handle);
>> @@ -2684,6 +2791,11 @@ static void cmd_leinfo(int dev_id, int argc, char **argv)
>>       hci_disconnect(dd, handle, HCI_OE_USER_ENDED_CONNECTION, 10000);
>>
>>       hci_close_dev(dd);
>> +     return;
>> +
>> +failure:
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static struct option lecc_options[] = {
>> @@ -2757,12 +2869,17 @@ static void cmd_lecc(int dev_id, int argc, char **argv)
>>                       min_ce_length, max_ce_length, &handle, 25000);
>>       if (err < 0) {
>>               perror("Could not create connection");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       printf("Connection handle %d\n", handle);
>>
>>       hci_close_dev(dd);
>> +     return;
>> +
>> +failure:
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static struct option lewladd_options[] = {
>> @@ -3276,10 +3393,15 @@ static void cmd_ledc(int dev_id, int argc, char **argv)
>>       err = hci_disconnect(dd, handle, reason, 10000);
>>       if (err < 0) {
>>               perror("Could not disconnect");
>> -             exit(1);
>> +             goto failure;
>>       }
>>
>>       hci_close_dev(dd);
>> +     return;
>> +
>> +failure:
>> +     hci_close_dev(dd);
>> +     exit(EXIT_FAILURE);
>>  }
>>
>>  static struct option lecup_options[] = {
>> --
>> 2.1.4
>>
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-- 
Luiz Augusto von Dentz
--
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