discover is showing UMRs when using getaddrinfo/getnameinfo

Hi,

I started playing with the discover (Studio 12.4, Solaris 11.2, x86) tool to check my apps for memory errors etc.

I noticed that I get UMR warnings/errors when using the getaddrinfo()/getnameinfo() socket functions. Why?

[email protected]_2_x86:/tmp $ cat getaddrinfo.c

#include <stdio.h>

#include <stdlib.h>

#include <netdb.h>

#include <netinet/in.h>

#include <sys/socket.h>

int

main(void)

{

    struct addrinfo *result, *res;

    int error;

    error = getaddrinfo("www.oracle.com", NULL, NULL, &result);

    for (res = result; res != NULL; res = res->ai_next)

    {

        char hostname[NI_MAXHOST];

        error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

        if (*hostname != '\0')

            printf("hostname: %s\n", hostname);

    }

    freeaddrinfo(result);

    return 0;

}

[email protected]_2_x86:/tmp $ cc -g getaddrinfo.c -lsocket

[email protected]_2_x86:/tmp $ discover -w - a.out

[email protected]_2_x86:/tmp $ ./a.out

ERROR 1 (UMR): accessing uninitialized data "result" at address 0xfeffe650 (4 bytes) on the stack at:

        main() + 0x141  <getaddrinfo.c:14>

                11:        int error;

                12:

                13:        error = getaddrinfo("www.oracle.com", NULL, NULL, &result);

                14:=>      for (res = result; res != NULL; res = res->ai_next)

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

        _start() + 0x71

ERROR 2 (UMR): accessing uninitialized data "*(result + 16)" at address 0x8080518 (4 bytes) on the heap at:

        main() + 0x247  <getaddrinfo.c:18>

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

                18:=>          error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

                19:            if (*hostname != '\0')

                20:                printf("hostname: %s\n", hostname);

                21:        }

        _start() + 0x71

    was allocated at (32 bytes):

        get_addr() + 0x22f

        _getaddrinfo() + 0x496

        getaddrinfo() + 0x1e

        main() + 0xee  <getaddrinfo.c:13>

                10:        struct addrinfo *result, *res;

                11:        int error;

                12:

                13:=>      error = getaddrinfo("www.oracle.com", NULL, NULL, &result);

                14:        for (res = result; res != NULL; res = res->ai_next)

                15:        {

                16:            char hostname[NI_MAXHOST];

        _start() + 0x71

ERROR 3 (UMR): accessing uninitialized data "*(result + 24)" at address 0x8080520 (4 bytes) on the heap at:

        main() + 0x289  <getaddrinfo.c:18>

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

                18:=>          error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

                19:            if (*hostname != '\0')

                20:                printf("hostname: %s\n", hostname);

                21:        }

        _start() + 0x71

    was allocated at (32 bytes):

        get_addr() + 0x22f

        _getaddrinfo() + 0x496

        getaddrinfo() + 0x1e

        main() + 0xee  <getaddrinfo.c:13>

                10:        struct addrinfo *result, *res;

                11:        int error;

                12:

                13:=>      error = getaddrinfo("www.oracle.com", NULL, NULL, &result);

                14:        for (res = result; res != NULL; res = res->ai_next)

                15:        {

                16:            char hostname[NI_MAXHOST];

        _start() + 0x71

ERROR 4 (PIR): accessing partially initialized data at address 0x8084cd5 (51 bytes) on the heap at:

        __mappedtov4() + 0x134

        getipnodebyaddr() + 0x179

        getnameinfo() + 0xbd

        main() + 0x2b1  <getaddrinfo.c:18>

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

                18:=>          error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

                19:            if (*hostname != '\0')

                20:                printf("hostname: %s\n", hostname);

                21:        }

        _start() + 0x71

    was allocated at (8500 bytes):

        __IPv6_alloc() + 0x39

        getipnodebyaddr() + 0x95

        getnameinfo() + 0xbd

        main() + 0x2b1  <getaddrinfo.c:18>

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

                18:=>          error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

                19:            if (*hostname != '\0')

                20:                printf("hostname: %s\n", hostname);

                21:        }

        _start() + 0x71

ERROR 5 (PIR): accessing partially initialized data at address 0x8086e51 (51 bytes) on the heap at:

        getnameinfo() + 0xf5

        main() + 0x2b1  <getaddrinfo.c:18>

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

                18:=>          error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

                19:            if (*hostname != '\0')

                20:                printf("hostname: %s\n", hostname);

                21:        }

        _start() + 0x71

    was allocated at (8500 bytes):

        __IPv6_alloc() + 0x39

        __mappedtov4() + 0x53

        getipnodebyaddr() + 0x179

        getnameinfo() + 0xbd

        main() + 0x2b1  <getaddrinfo.c:18>

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

                18:=>          error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

                19:            if (*hostname != '\0')

                20:                printf("hostname: %s\n", hostname);

                21:        }

        _start() + 0x71

hostname: a23-43-22-140.deploy.static.akamaitechnologies.com

ERROR 6 (UMR): accessing uninitialized data "*(result + 28)" at address 0x8080524 (4 bytes) on the heap at:

        main() + 0x37a  <getaddrinfo.c:14>

                11:        int error;

                12:

                13:        error = getaddrinfo("www.oracle.com", NULL, NULL, &result);

                14:=>      for (res = result; res != NULL; res = res->ai_next)

                15:        {

                16:            char hostname[NI_MAXHOST];

                17:

        _start() + 0x71

    was allocated at (32 bytes):

        get_addr() + 0x22f

        _getaddrinfo() + 0x496

        getaddrinfo() + 0x1e

        main() + 0xee  <getaddrinfo.c:13>

                10:        struct addrinfo *result, *res;

                11:        int error;

                12:

                13:=>      error = getaddrinfo("www.oracle.com", NULL, NULL, &result);

                14:        for (res = result; res != NULL; res = res->ai_next)

                15:        {

                16:            char hostname[NI_MAXHOST];

        _start() + 0x71

***************** Discover Memory Report *****************

No allocated memory left on program exit.

DISCOVER SUMMARY:

        unique errors   : 6 (6 total)

        unique warnings : 0 (0 total)