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[BZ #4439]

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2007-04-30  Jakub Jelinek  <jakub@redhat.com>
	[BZ #4439]
	* resolv/inet_ntop.c (inet_ntop4): Take terminating '\0' into
	account in the size check.
	* resolv/tst-inet_ntop.c: New test.
	* resolv/Makefile (tests): Add tst-inet_ntop.
This commit is contained in:
Ulrich Drepper 2007-04-30 22:30:14 +00:00
parent 7ecfbd386a
commit 37f02b1da5
4 changed files with 122 additions and 3 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2007-04-30 Jakub Jelinek <jakub@redhat.com>
[BZ #4439]
* resolv/inet_ntop.c (inet_ntop4): Take terminating '\0' into
account in the size check.
* resolv/tst-inet_ntop.c: New test.
* resolv/Makefile (tests): Add tst-inet_ntop.
2007-04-30 Ulrich Drepper <drepper@redhat.com>
Jakub Jelinek <jakub@redhat.com>

4
resolv/Makefile
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@ -1,4 +1,4 @@
# Copyright (C) 1994,1995,1996,1997,1998,1999,2000,2001,2003,2004
# Copyright (C) 1994,1995,1996,1997,1998,1999,2000,2001,2003,2004,2007
# Free Software Foundation, Inc.
# This file is part of the GNU C Library.
@ -32,7 +32,7 @@ distribute := ../conf/portability.h mapv4v6addr.h mapv4v6hostent.h \
routines := herror inet_addr inet_ntop inet_pton nsap_addr res_init \
res_hconf res_libc res-state
tests = tst-aton tst-leaks
tests = tst-aton tst-leaks tst-inet_ntop
xtests = tst-leaks2
generate := mtrace-tst-leaks tst-leaks.mtrace tst-leaks2.mtrace

2
resolv/inet_ntop.c
View File

@ -96,7 +96,7 @@ inet_ntop4(src, dst, size)
static const char fmt[] = "%u.%u.%u.%u";
char tmp[sizeof "255.255.255.255"];
if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) > size) {
if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) >= size) {
__set_errno (ENOSPC);
return (NULL);
}

111
resolv/tst-inet_ntop.c Normal file
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@ -0,0 +1,111 @@
#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
int
main (void)
{
struct in_addr addr4;
struct in6_addr addr6;
char buf[64];
int result = 0;
addr4.s_addr = 0xe0e0e0e0;
addr6.s6_addr16[0] = 0;
addr6.s6_addr16[1] = 0;
addr6.s6_addr16[2] = 0;
addr6.s6_addr16[3] = 0;
addr6.s6_addr16[4] = 0;
addr6.s6_addr16[5] = 0xffff;
addr6.s6_addr32[3] = 0xe0e0e0e0;
memset (buf, 'x', sizeof buf);
if (inet_ntop (AF_INET, &addr4, buf, 15) != NULL)
{
puts ("1st inet_ntop returned non-NULL");
result++;
}
else if (errno != ENOSPC)
{
puts ("1st inet_ntop didn't fail with ENOSPC");
result++;
}
if (buf[15] != 'x')
{
puts ("1st inet_ntop wrote past the end of buffer");
result++;
}
if (inet_ntop (AF_INET, &addr4, buf, 16) != buf)
{
puts ("2nd inet_ntop did not return buf");
result++;
}
if (memcmp (buf, "224.224.224.224\0" "xxxxxxxx", 24) != 0)
{
puts ("2nd inet_ntop wrote past the end of buffer");
result++;
}
if (inet_ntop (AF_INET6, &addr6, buf, 22) != NULL)
{
puts ("3rd inet_ntop returned non-NULL");
result++;
}
else if (errno != ENOSPC)
{
puts ("3rd inet_ntop didn't fail with ENOSPC");
result++;
}
if (buf[22] != 'x')
{
puts ("3rd inet_ntop wrote past the end of buffer");
result++;
}
if (inet_ntop (AF_INET6, &addr6, buf, 23) != buf)
{
puts ("4th inet_ntop did not return buf");
result++;
}
if (memcmp (buf, "::ffff:224.224.224.224\0" "xxxxxxxx", 31) != 0)
{
puts ("4th inet_ntop wrote past the end of buffer");
result++;
}
memset (&addr6.s6_addr, 0xe0, sizeof (addr6.s6_addr));
if (inet_ntop (AF_INET6, &addr6, buf, 39) != NULL)
{
puts ("5th inet_ntop returned non-NULL");
result++;
}
else if (errno != ENOSPC)
{
puts ("5th inet_ntop didn't fail with ENOSPC");
result++;
}
if (buf[39] != 'x')
{
puts ("5th inet_ntop wrote past the end of buffer");
result++;
}
if (inet_ntop (AF_INET6, &addr6, buf, 40) != buf)
{
puts ("6th inet_ntop did not return buf");
result++;
}
if (memcmp (buf, "e0e0:e0e0:e0e0:e0e0:e0e0:e0e0:e0e0:e0e0\0"
"xxxxxxxx", 48) != 0)
{
puts ("6th inet_ntop wrote past the end of buffer");
result++;
}
return result;
}