Return EAI_SYSTEM if we're out of file descriptors

Resolves BZ #14719.

Conflicts:
	ChangeLog
	NEWS

5 files changed, 46 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index 6fc9ebcf8a..bef6c5c780 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2012-11-19  Siddhesh Poyarekar  <siddhesh@redhat.com>
+
+	[BZ #14719]
+	* nss/getXXbyYY_r.c (INTERNAL (REENTRANT_NAME)): Set h_errno to
+	NETDB_INTERNAL when NSS_STATUS_UNAVAIL.
+	* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyname3_r): Set
+	h_errno to NETDB_INTERNAL when errno is EMFILE or ENFILE.
+	(_nss_dns_gethostbyname4_r): Likewise.
+	* sysdeps/posix/getaddrinfo.c (gaih_inet): Set result to
+	EAI_SYSTEM if NSS_STATUS_UNAVAIL.
+
 2013-09-25  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
 	* sysdeps/powerpc/powerpc64/stackguard-macros.h (POINTER_CHK_GUARD:
diff --git a/NEWS b/NEWS
index aa9544fa30..a9f0b50cf5 100644
--- a/NEWS
+++ b/NEWS
@@ -9,8 +9,8 @@ Version 2.16.1
 
 * The following bugs are resolved with this release:
 
-  6530, 14195, 14547, 14459, 14476, 14562, 14621, 14648, 14699, 14756, 14831,
-  15078, 15754, 15755, 16072, 16431, 16617, 17048, 17137, 17187, 17325,
+  6530, 14195, 14547, 14459, 14476, 14562, 14621, 14648, 14699, 14719, 14756,
+  14831, 15078, 15754, 15755, 16072, 16431, 16617, 17048, 17137, 17187, 17325,
   17625, 17630.
 
 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
diff --git a/nss/getXXbyYY_r.c b/nss/getXXbyYY_r.c
index d197c9be17..50c04068f2 100644
--- a/nss/getXXbyYY_r.c
+++ b/nss/getXXbyYY_r.c
@@ -276,7 +276,12 @@ done:
 #endif
   *result = status == NSS_STATUS_SUCCESS ? resbuf : NULL;
 #ifdef NEED_H_ERRNO
-  if (status != NSS_STATUS_SUCCESS && ! any_service)
+  if (status == NSS_STATUS_UNAVAIL)
+    /* Either we failed to lookup the functions or the functions themselves
+       had a system error.  Set NETDB_INTERNAL here to let the caller know
+       that the errno may have the real reason for failure.  */
+      *h_errnop = NETDB_INTERNAL;
+  else if (status != NSS_STATUS_SUCCESS && !any_service)
     /* We were not able to use any service.  */
     *h_errnop = NO_RECOVERY;
 #endif
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index a924d40844..00caff5a2e 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -203,6 +203,11 @@ _nss_dns_gethostbyname3_r (const char *name, int af, struct hostent *result,
 	  status = NSS_STATUS_TRYAGAIN;
 	  h_errno = TRY_AGAIN;
 	  break;
+	/* System has run out of file descriptors.  */
+	case EMFILE:
+	case ENFILE:
+	  h_errno = NETDB_INTERNAL;
+	  /* Fall through.  */
 	case ECONNREFUSED:
 	case ETIMEDOUT:
 	  status = NSS_STATUS_UNAVAIL;
@@ -315,14 +320,26 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
 			      &ans2p, &nans2p, &resplen2);
   if (n < 0)
     {
-      if (errno == ESRCH)
+      switch (errno)
 	{
+	case ESRCH:
 	  status = NSS_STATUS_TRYAGAIN;
 	  h_errno = TRY_AGAIN;
+	  break;
+	/* System has run out of file descriptors.  */
+	case EMFILE:
+	case ENFILE:
+	  h_errno = NETDB_INTERNAL;
+	  /* Fall through.  */
+	case ECONNREFUSED:
+	case ETIMEDOUT:
+	  status = NSS_STATUS_UNAVAIL;
+	  break;
+	default:
+	  status = NSS_STATUS_NOTFOUND;
+	  break;
 	}
-      else
-	status = (errno == ECONNREFUSED
-		  ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND);
+
       *herrnop = h_errno;
       if (h_errno == TRY_AGAIN)
 	*errnop = EAGAIN;
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 0146eb95b9..dd85130554 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -1058,6 +1058,12 @@ gaih_inet (const char *name, const struct gaih_service *service,
 
 	  _res.options |= old_res_options & RES_USE_INET6;
 
+	  if (status == NSS_STATUS_UNAVAIL)
+	    {
+	      result = GAIH_OKIFUNSPEC | -EAI_SYSTEM;
+	      goto free_and_return;
+	    }
+
 	  if (no_data != 0 && no_inet6_data != 0)
 	    {
 	      /* If both requests timed out report this.  */