Linux getifaddrs might return entries with ->ifa_addr being NULL.

ChangeLog

@@ -1,3 +1,9 @@
+2010-10-11  Ulrich Drepper  <drepper@gmail.com>
+
+	[BZ #12093]
+	* sysdeps/unix/sysv/linux/check_pf.c (__check_pf): ->ifa_addr might
+	be NULL.
+
 2010-10-07  Jakub Jelinek  <jakub@redhat.com>
 
 	[BZ #3268]

NEWS

@@ -10,7 +10,7 @@ Version 2.13
 * The following bugs are resolved with this release:
 
   3268, 7066, 10851, 11611, 11640, 11701, 11840, 11856, 11883, 11903, 11904,
-  11968, 11979, 12005, 12037, 12067, 12077, 12092, 12107
+  11968, 11979, 12005, 12037, 12067, 12077, 12092, 12093, 12107
 
 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
 

sysdeps/unix/sysv/linux/check_pf.c

@@ -1,5 +1,5 @@
 /* Determine protocol families for which interfaces exist.  Linux version.
-   Copyright (C) 2003, 2006, 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2006, 2007, 2008, 2010 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -304,10 +304,13 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6,
 
   struct ifaddrs *runp;
   for (runp = ifa; runp != NULL; runp = runp->ifa_next)
-    if (runp->ifa_addr->sa_family == PF_INET)
-      *seen_ipv4 = true;
-    else if (runp->ifa_addr->sa_family == PF_INET6)
-      *seen_ipv6 = true;
+    if (runp->ifa_addr != NULL)
+      {
+	if (runp->ifa_addr->sa_family == PF_INET)
+	  *seen_ipv4 = true;
+	else if (runp->ifa_addr->sa_family == PF_INET6)
+	  *seen_ipv6 = true;
+      }
 
   (void) freeifaddrs (ifa);
 #endif