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| author | Ulrich Drepper <drepper@redhat.com> | 2007-04-23 15:17:21 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2007-04-23 15:17:21 +0000 |
| commit | 2f1687b96b25af512b095c9ebfa283f63c13bb78 (patch) | |
| tree | 6181e875e18f83e0fba9b805c7024e67d86253e0 /resolv/nss_dns/dns-host.c | |
| parent | a15ccd8f07d7afbbd7635f350e318ede84709ac6 (diff) | |
| download | glibc-2f1687b96b25af512b095c9ebfa283f63c13bb78.tar.gz glibc-2f1687b96b25af512b095c9ebfa283f63c13bb78.tar.xz glibc-2f1687b96b25af512b095c9ebfa283f63c13bb78.zip | |
[BZ #4381]
* nss/nss_files/files-hosts.c (HOST_DB_LOOKUP): Ensure sufficient alignment of buffer and tmp_buffer. * nis/nss_nis/nis-hosts.c (internal_nis_gethostent_r, internal_gethostbyname2_r, _nss_nis_gethostbyaddr_r): Ensure sufficient alignment of buffer. * resolv/nss_dns/dns-hosts.c (getanswer_r): Likewise. Handle buflen bigger than INT_MAX. * resolv/nss_dns/dns-network.c (getanswer_r): Likewise. Add errnop and h_errnop arguments. Fail if buflen is too small. (_nss_dns_getnetbyname_r, _nss_dns_getnetbyaddr_r): Adjust callers. 2007-04-23 Jakub Jelinek <jakub@redhat.com>
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; |