Fix crash when reading 'timezone = unknown' from postgresql.conf during

SIGHUP; it's not OK for an assign_hook to return a non-malloc'd string.
Problem was introduced during timezone library rewrite.

diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 9254d57e345bcaf99727be68cd3cc4106e420865..845c59625d6a1aebc51913fc455e3eb87e67ac0b 100644 (file)
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *   $PostgreSQL: pgsql/src/backend/commands/variable.c,v 1.112 2005/07/25 22:12:32 tgl Exp $
+ *   $PostgreSQL: pgsql/src/backend/commands/variable.c,v 1.113 2005/08/08 23:39:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -346,10 +346,13 @@ assign_timezone(const char *value, bool doit, GucSource source)
             * pg_timezone_initialize() will eventually select a default
             * value from the environment.
             */
-           const char *curzone = pg_get_timezone_name(global_timezone);
+           if (doit)
+           {
+               const char *curzone = pg_get_timezone_name(global_timezone);
 
-           if (curzone)
-               value = curzone;
+               if (curzone)
+                   value = curzone;
+           }
        }
        else
        {