Fix assign_pgstat_temp_directory() to ensure the directory path is

canonicalized.  Avoid the need to elog(FATAL) on out-of-memory.

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.503 2009/04/23 00:23:45 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.504 2009/05/03 20:09:54 tgl Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -7618,19 +7618,28 @@ assign_pgstat_temp_directory(const char *newval, bool doit, GucSource source)
 {
 	if (doit)
 	{
+		char	   *canon_val = guc_strdup(ERROR, newval);
+		char	   *tname;
+		char	   *fname;
+
+		canonicalize_path(canon_val);
+
+		tname = guc_malloc(ERROR, strlen(canon_val) + 12);	/* /pgstat.tmp */
+		sprintf(tname, "%s/pgstat.tmp", canon_val);
+		fname = guc_malloc(ERROR, strlen(canon_val) + 13);	/* /pgstat.stat */
+		sprintf(fname, "%s/pgstat.stat", canon_val);
+
 		if (pgstat_stat_tmpname)
 			free(pgstat_stat_tmpname);
+		pgstat_stat_tmpname = tname;
 		if (pgstat_stat_filename)
 			free(pgstat_stat_filename);
+		pgstat_stat_filename = fname;
 
-		pgstat_stat_tmpname = guc_malloc(FATAL, strlen(newval) + 12);  /* /pgstat.tmp */
-		pgstat_stat_filename = guc_malloc(FATAL, strlen(newval) + 13); /* /pgstat.stat */
-
-		sprintf(pgstat_stat_tmpname, "%s/pgstat.tmp", newval);
-		sprintf(pgstat_stat_filename, "%s/pgstat.stat", newval);
+		return canon_val;
 	}
-
-	return newval;
+	else
+		return newval;
 }
 
 #include "guc-file.c"