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Commitdbc632e

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Make path_recv() and poly_recv() reject paths/polygons containing no points.
The zero-point case is sensible so far as the data structure is concerned,so maybe we ought to allow it sometime; but right now the textual inputroutines for these types don't allow it, and it seems that not all thefunctions for the types are prepared to cope.Report and patch by Merlin Moncure.
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‎src/backend/utils/adt/geo_ops.c

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
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*
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* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.97 2007/11/15 21:14:39 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.98 2007/12/18 00:04:08 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -1456,7 +1456,7 @@ path_recv(PG_FUNCTION_ARGS)
14561456

14571457
closed=pq_getmsgbyte(buf);
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npts=pq_getmsgint(buf,sizeof(int32));
1459-
if (npts<0||npts >= (int32) ((INT_MAX- offsetof(PATH,p[0])) /sizeof(Point)))
1459+
if (npts <=0||npts >= (int32) ((INT_MAX- offsetof(PATH,p[0])) /sizeof(Point)))
14601460
ereport(ERROR,
14611461
(errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
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errmsg("invalid number of points in external \"path\" value")));
@@ -3484,7 +3484,7 @@ poly_recv(PG_FUNCTION_ARGS)
34843484
intsize;
34853485

34863486
npts=pq_getmsgint(buf,sizeof(int32));
3487-
if (npts<0||npts >= (int32) ((INT_MAX- offsetof(POLYGON,p[0])) /sizeof(Point)))
3487+
if (npts <=0||npts >= (int32) ((INT_MAX- offsetof(POLYGON,p[0])) /sizeof(Point)))
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ereport(ERROR,
34893489
(errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
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errmsg("invalid number of points in external \"polygon\" value")));

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