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authorUlrich Drepper <drepper@redhat.com>2007-04-23 15:17:21 +0000
committerUlrich Drepper <drepper@redhat.com>2007-04-23 15:17:21 +0000
commit2f1687b96b25af512b095c9ebfa283f63c13bb78 (patch)
tree6181e875e18f83e0fba9b805c7024e67d86253e0 /resolv/nss_dns/dns-host.c
parenta15ccd8f07d7afbbd7635f350e318ede84709ac6 (diff)
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[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.c15
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;