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Hi! The size check doesn't take into account the trailing '\0'. 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. --- libc/resolv/inet_ntop.c.jj 2002-08-03 14:08:47.000000000 +0200 +++ libc/resolv/inet_ntop.c 2007-04-30 18:02:12.000000000 +0200 @@ -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); } --- libc/resolv/tst-inet_ntop.c.jj 2007-04-30 18:36:40.000000000 +0200 +++ libc/resolv/tst-inet_ntop.c 2007-04-30 18:35:09.000000000 +0200 @@ -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; +} --- libc/resolv/Makefile.jj 2004-08-15 22:21:59.000000000 +0200 +++ libc/resolv/Makefile 2007-04-30 18:39:23.000000000 +0200 @@ -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 mapv 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 Jakub
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