diff options
Diffstat (limited to 'resolv/nss_dns/dns-host.c')
| -rw-r--r-- | resolv/nss_dns/dns-host.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c index 7045c5915b..cf060be8ef 100644 --- a/resolv/nss_dns/dns-host.c +++ b/resolv/nss_dns/dns-host.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996-2003, 2004 Free Software Foundation, Inc. +/* Copyright (C) 1996-2003, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -465,8 +465,8 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, char *aliases[MAX_NR_ALIASES]; unsigned char host_addr[16]; /* IPv4 or IPv6 */ char *h_addr_ptrs[0]; - } *host_data = (struct host_data *) buffer; - int linebuflen = buflen - sizeof (struct host_data); + } *host_data; + int linebuflen; register const HEADER *hp; const u_char *end_of_message, *cp; int n, ancount, qdcount; @@ -478,8 +478,9 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, u_char packtmp[NS_MAXCDNAME]; int have_to_map = 0; int32_t ttl = 0; - - if (__builtin_expect (linebuflen, 0) < 0) + uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data); + buffer += pad; + if (__builtin_expect (buflen < sizeof (struct host_data) + pad, 0)) { /* The buffer is too small. */ too_small: @@ -487,6 +488,10 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, *h_errnop = NETDB_INTERNAL; return NSS_STATUS_TRYAGAIN; } + host_data = (struct host_data *) buffer; + linebuflen = buflen - sizeof (struct host_data); + if (buflen - sizeof (struct host_data) != linebuflen) + linebuflen = INT_MAX; tname = qname; result->h_name = NULL; |