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-rw-r--r--ChangeLog7
-rw-r--r--NEWS4
-rw-r--r--resolv/nss_dns/dns-network.c5
3 files changed, 12 insertions, 4 deletions
diff --git a/ChangeLog b/ChangeLog
index 3652d5f029..4b5cd019e1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2016-05-24  Florian Weimer  <fweimer@redhat.com>
+
+	[BZ #19879]
+	CVE-2016-3075
+	* resolv/nss_dns/dns-network.c (_nss_dns_getnetbyname_r): Do not
+	copy name.
+
 2016-05-24  Paul Pluzhnikov  <ppluzhnikov@google.com>
 
 	[BZ #17905]
diff --git a/NEWS b/NEWS
index e6a520774a..dc8679f8ca 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,10 @@ Version 2.20.1
   called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
   Reported by Alexander Cherepanov.  (CVE-2016-1234)
 
+* An unnecessary stack copy in _nss_dns_getnetbyname_r was removed.  It
+  could result in a stack overflow when getnetbyname was called with an
+  overly long name.  (CVE-2016-3075)
+
 * Previously, getaddrinfo copied large amounts of address data to the stack,
   even after the fix for CVE-2013-4458 has been applied, potentially
   resulting in a stack overflow.  getaddrinfo now uses a heap allocation
diff --git a/resolv/nss_dns/dns-network.c b/resolv/nss_dns/dns-network.c
index 08cf0a6462..335604adc2 100644
--- a/resolv/nss_dns/dns-network.c
+++ b/resolv/nss_dns/dns-network.c
@@ -118,17 +118,14 @@ _nss_dns_getnetbyname_r (const char *name, struct netent *result,
   } net_buffer;
   querybuf *orig_net_buffer;
   int anslen;
-  char *qbuf;
   enum nss_status status;
 
   if (__res_maybe_init (&_res, 0) == -1)
     return NSS_STATUS_UNAVAIL;
 
-  qbuf = strdupa (name);
-
   net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
 
-  anslen = __libc_res_nsearch (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf,
+  anslen = __libc_res_nsearch (&_res, name, C_IN, T_PTR, net_buffer.buf->buf,
 			       1024, &net_buffer.ptr, NULL, NULL, NULL, NULL);
   if (anslen < 0)
     {