From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 4 Mar 2013 20:13:31 +0000 (-0500)
Subject: Fix overflow check in tm2timestamp (this time for sure).
X-Git-Tag: REL8_4_17~13
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cf678140548b0f0fdef36f314bb84e07e15b8c16;p=postgresql

Fix overflow check in tm2timestamp (this time for sure).

I fixed this code back in commit 841b4a2d5, but didn't think carefully
enough about the behavior near zero, which meant it improperly rejected
1999-12-31 24:00:00.  Per report from Magnus Hagander.
---

diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index f4687d4ea9..fdd0cf4393 100644
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -1559,8 +1559,9 @@ tm2timestamp(struct pg_tm * tm, fsec_t fsec, int *tzp, Timestamp *result)
 		return -1;
 	}
 	/* check for just-barely overflow (okay except time-of-day wraps) */
-	if ((*result < 0 && date >= 0) ||
-		(*result >= 0 && date < 0))
+	/* caution: we want to allow 1999-12-31 24:00:00 */
+	if ((*result < 0 && date > 0) ||
+		(*result > 0 && date < -1))
 	{
 		*result = 0;			/* keep compiler quiet */
 		return -1;
diff --git a/src/interfaces/ecpg/pgtypeslib/timestamp.c b/src/interfaces/ecpg/pgtypeslib/timestamp.c
index 22e3ce7273..f50feaf9cf 100644
--- a/src/interfaces/ecpg/pgtypeslib/timestamp.c
+++ b/src/interfaces/ecpg/pgtypeslib/timestamp.c
@@ -76,8 +76,9 @@ tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, timestamp * result)
 	if ((*result - time) / USECS_PER_DAY != dDate)
 		return -1;
 	/* check for just-barely overflow (okay except time-of-day wraps) */
-	if ((*result < 0 && dDate >= 0) ||
-		(*result >= 0 && dDate < 0))
+	/* caution: we want to allow 1999-12-31 24:00:00 */
+	if ((*result < 0 && dDate > 0) ||
+		(*result > 0 && dDate < -1))
 		return -1;
 #else
 	*result = dDate * SECS_PER_DAY + time;