Fix division by zero error in date_bin

j-naylor · j-naylor · commit a0db4294aeff · 2021-07-22T17:34:19.000-04:00
Bauyrzhan Sakhariyev, via Github

Backpatch to v14
diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
@@ -3843,6 +3843,11 @@ timestamp_bin(PG_FUNCTION_ARGS)
 
 	stride_usecs = stride->day * USECS_PER_DAY + stride->time;
 
+	if (stride_usecs == 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
+				 errmsg("stride cannot equal zero")));
+
 	tm_diff = timestamp - origin;
 	tm_delta = tm_diff - tm_diff % stride_usecs;
 
@@ -4021,6 +4026,11 @@ timestamptz_bin(PG_FUNCTION_ARGS)
 
 	stride_usecs = stride->day * USECS_PER_DAY + stride->time;
 
+	if (stride_usecs == 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
+				 errmsg("stride cannot equal zero")));
+
 	tm_diff = timestamp - origin;
 	tm_delta = tm_diff - tm_diff % stride_usecs;
 
diff --git a/src/test/regress/expected/timestamp.out b/src/test/regress/expected/timestamp.out
@@ -704,6 +704,9 @@ SELECT date_bin('5 months'::interval, timestamp '2020-02-01 01:01:01', timestamp
 ERROR:  timestamps cannot be binned into intervals containing months or years
 SELECT date_bin('5 years'::interval,  timestamp '2020-02-01 01:01:01', timestamp '2001-01-01');
 ERROR:  timestamps cannot be binned into intervals containing months or years
+-- disallow zero intervals
+SELECT date_bin('0 days'::interval, timestamp '1970-01-01 01:00:00' , timestamp '1970-01-01 00:00:00');
+ERROR:  stride cannot equal zero
 -- Test casting within a BETWEEN qualifier
 SELECT d1 - timestamp without time zone '1997-01-02' AS diff
   FROM TIMESTAMP_TBL
diff --git a/src/test/regress/expected/timestamptz.out b/src/test/regress/expected/timestamptz.out
@@ -748,6 +748,9 @@ SELECT date_bin('5 months'::interval, timestamp with time zone '2020-02-01 01:01
 ERROR:  timestamps cannot be binned into intervals containing months or years
 SELECT date_bin('5 years'::interval,  timestamp with time zone '2020-02-01 01:01:01+00', timestamp with time zone '2001-01-01+00');
 ERROR:  timestamps cannot be binned into intervals containing months or years
+-- disallow zero intervals
+SELECT date_bin('0 days'::interval, timestamp with time zone '1970-01-01 01:00:00+00' , timestamp with time zone '1970-01-01 00:00:00+00');
+ERROR:  stride cannot equal zero
 -- Test casting within a BETWEEN qualifier
 SELECT d1 - timestamp with time zone '1997-01-02' AS diff
   FROM TIMESTAMPTZ_TBL
diff --git a/src/test/regress/sql/timestamp.sql b/src/test/regress/sql/timestamp.sql
@@ -263,6 +263,9 @@ SELECT date_bin('5 min'::interval, timestamp '2020-02-01 01:01:01', timestamp '2
 SELECT date_bin('5 months'::interval, timestamp '2020-02-01 01:01:01', timestamp '2001-01-01');
 SELECT date_bin('5 years'::interval,  timestamp '2020-02-01 01:01:01', timestamp '2001-01-01');
 
+-- disallow zero intervals
+SELECT date_bin('0 days'::interval, timestamp '1970-01-01 01:00:00' , timestamp '1970-01-01 00:00:00');
+
 -- Test casting within a BETWEEN qualifier
 SELECT d1 - timestamp without time zone '1997-01-02' AS diff
   FROM TIMESTAMP_TBL
diff --git a/src/test/regress/sql/timestamptz.sql b/src/test/regress/sql/timestamptz.sql
@@ -238,6 +238,9 @@ SELECT date_bin('5 min'::interval, timestamptz '2020-02-01 01:01:01+00', timesta
 SELECT date_bin('5 months'::interval, timestamp with time zone '2020-02-01 01:01:01+00', timestamp with time zone '2001-01-01+00');
 SELECT date_bin('5 years'::interval,  timestamp with time zone '2020-02-01 01:01:01+00', timestamp with time zone '2001-01-01+00');
 
+-- disallow zero intervals
+SELECT date_bin('0 days'::interval, timestamp with time zone '1970-01-01 01:00:00+00' , timestamp with time zone '1970-01-01 00:00:00+00');
+
 -- Test casting within a BETWEEN qualifier
 SELECT d1 - timestamp with time zone '1997-01-02' AS diff
   FROM TIMESTAMPTZ_TBL
