diff options
Diffstat (limited to 'resolv/nss_dns')
| -rw-r--r-- | resolv/nss_dns/dns-host.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c index b8e513a929..a9462ae97a 100644 --- a/resolv/nss_dns/dns-host.c +++ b/resolv/nss_dns/dns-host.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996-2004, 2007, 2008 Free Software Foundation, Inc. +/* Copyright (C) 1996-2004, 2007, 2008, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -376,6 +376,19 @@ _nss_dns_gethostbyaddr2_r (const void *addr, socklen_t len, int af, int n, status; int olderr = errno; + uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data); + buffer += pad; + buflen = buflen > pad ? buflen - pad : 0; + + if (__builtin_expect (buflen < sizeof (struct host_data), 0)) + { + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + host_data = (struct host_data *) buffer; + if (__res_maybe_init (&_res, 0) == -1) return NSS_STATUS_UNAVAIL; |