From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Tue, 18 Aug 2009 21:23:14 +0000 (+0000)
Subject: Fix overflow for INTERVAL 'x ms' where x is more than a couple million,
X-Git-Tag: REL8_5_ALPHA1~5
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3bd2241135d18767cf40fc9a39a4afd4ce3ff3a6;p=postgresql

Fix overflow for INTERVAL 'x ms' where x is more than a couple million,
and integer datetimes are in use.  Per bug report from Hubert Depesz
Lubaczewski.

Alex Hunsaker
---

diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c
index 186522148d..6f0f5ce986 100644
--- a/src/backend/utils/adt/datetime.c
+++ b/src/backend/utils/adt/datetime.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.208 2009/06/11 14:49:03 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.209 2009/08/18 21:23:14 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2986,6 +2986,9 @@ DecodeInterval(char **field, int *ftype, int nf, int range,
 						break;
 
 					case DTK_MILLISEC:
+						/* avoid overflowing the fsec field */
+						tm->tm_sec += val / 1000;
+						val -= (val / 1000) * 1000;
 #ifdef HAVE_INT64_TIMESTAMP
 						*fsec += rint((val + fval) * 1000);
 #else
diff --git a/src/include/utils/timestamp.h b/src/include/utils/timestamp.h
index 291de5cdea..ad93f9d67e 100644
--- a/src/include/utils/timestamp.h
+++ b/src/include/utils/timestamp.h
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.80 2009/06/11 14:49:13 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.81 2009/08/18 21:23:14 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -39,6 +39,8 @@
  * TimeOffset and fsec_t are convenience typedefs for temporary variables
  * that are of different types in the two cases.  Do not use fsec_t in values
  * stored on-disk, since it is not the same size in both implementations.
+ * Also, fsec_t is only meant for *fractional* seconds; beware of overflow
+ * if the value you need to store could be many seconds.
  */
 
 #ifdef HAVE_INT64_TIMESTAMP