Correct code to calculate timing values in client to compare

rebind value to infinity instead of renew value.
[ISC-Bugs #29062]

RELNOTES

@@ -49,6 +49,14 @@ work on other platforms. Please report any problems and suggested fixes to
   to perform an fsync() operation on the lease database before reply,
   which improves performance. [ISC-Bugs #22228]
 
+			Changes since 4.2.4
+
+- Correct code to calculate timing values in client to compare
+  rebind value to infinity instead of renew value.
+  Thanks to Chenda Huang from H3C Technologies Co., Limited
+  for reporting this issue.
+  [ISC-Bugs #29062]
+
 			Changes since 4.2.3
 
 ! Add a check for a null pointer before calling the regexec function.

client/dhc6.c

@@ -1,6 +1,7 @@
 /* dhc6.c - DHCPv6 client routines. */
 
 /*
+ * Copyright (c) 2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 2006-2010 by Internet Systems Consortium, Inc. ("ISC")
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -4023,7 +4024,7 @@ dhc6_check_times(struct client_state *client)
 				/* Set rebind to 3/4 expiration interval. */
 				tmp = ia->starts;
 				tmp += use_expire + (use_expire / 2);
-			} else if (ia->renew == 0xffffffff)
+			} else if (ia->rebind == 0xffffffff)
 				tmp = MAX_TIME;
 			else
 				tmp = ia->starts + ia->rebind;