Check to ensure the number of primary key fields supplied does not

exceed the total number of non-dropped source table fields for
dblink_build_sql_*(). Addresses bug report from Rushabh Lathia.

Backpatch all the way to the 7.3 branch.

diff --git a/contrib/dblink/dblink.c b/contrib/dblink/dblink.c
index ded7832f335c37219f70cfe19a8bb1d11679e0b0..9806160be2d5b29054aea89e38389e161d9e24b0 100644 (file)
--- a/contrib/dblink/dblink.c
+++ b/contrib/dblink/dblink.c
@@ -8,7 +8,7 @@
  * Darko Prenosil <Darko.Prenosil@finteh.hr>
  * Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
  *
- * $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.87 2010/01/24 22:19:38 joe Exp $
+ * $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.88 2010/02/03 23:01:11 joe Exp $
  * Copyright (c) 2001-2010, PostgreSQL Global Development Group
  * ALL RIGHTS RESERVED;
  *
@@ -101,6 +101,7 @@ static void dblink_security_check(PGconn *conn, remoteConn *rconn);
 static void dblink_res_error(const char *conname, PGresult *res, const char *dblink_context_msg, bool fail);
 static char *get_connect_string(const char *servername);
 static char *escape_param_str(const char *from);
+static int get_nondropped_natts(Oid relid);
 
 /* Global */
 static remoteConn *pconn = NULL;
@@ -1262,6 +1263,7 @@ dblink_build_sql_insert(PG_FUNCTION_ARGS)
        int                     src_nitems;
        int                     tgt_nitems;
        char       *sql;
+       int                     nondropped_natts;
 
        /*
         * Convert relname to rel OID.
@@ -1289,6 +1291,15 @@ dblink_build_sql_insert(PG_FUNCTION_ARGS)
                                 errmsg("input for number of primary key " \
                                                "attributes too large")));
 
+       /*
+        * ensure we don't ask for more pk attributes than we have
+        * non-dropped columns
+        */
+       nondropped_natts = get_nondropped_natts(relid);
+       if (pknumatts > nondropped_natts)
+               ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
+                               errmsg("number of primary key fields exceeds number of specified relation attributes")));
+
        /*
         * Source array is made up of key values that will be used to locate the
         * tuple of interest from the local system.
@@ -1354,6 +1365,7 @@ dblink_build_sql_delete(PG_FUNCTION_ARGS)
        int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
        int32           pknumatts_tmp = PG_GETARG_INT32(2);
        ArrayType  *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
+       int                     nondropped_natts;
        Oid                     relid;
        int16           pknumatts = 0;
        char      **tgt_pkattvals;
@@ -1386,6 +1398,15 @@ dblink_build_sql_delete(PG_FUNCTION_ARGS)
                                 errmsg("input for number of primary key " \
                                                "attributes too large")));
 
+       /*
+        * ensure we don't ask for more pk attributes than we have
+        * non-dropped columns
+        */
+       nondropped_natts = get_nondropped_natts(relid);
+       if (pknumatts > nondropped_natts)
+               ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
+                               errmsg("number of primary key fields exceeds number of specified relation attributes")));
+
        /*
         * Target array is made up of key values that will be used to build the
         * SQL string for use on the remote system.
@@ -1441,6 +1462,7 @@ dblink_build_sql_update(PG_FUNCTION_ARGS)
        int32           pknumatts_tmp = PG_GETARG_INT32(2);
        ArrayType  *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
        ArrayType  *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
+       int                     nondropped_natts;
        Oid                     relid;
        int16           pknumatts = 0;
        char      **src_pkattvals;
@@ -1475,6 +1497,15 @@ dblink_build_sql_update(PG_FUNCTION_ARGS)
                                 errmsg("input for number of primary key " \
                                                "attributes too large")));
 
+       /*
+        * ensure we don't ask for more pk attributes than we have
+        * non-dropped columns
+        */
+       nondropped_natts = get_nondropped_natts(relid);
+       if (pknumatts > nondropped_natts)
+               ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
+                               errmsg("number of primary key fields exceeds number of specified relation attributes")));
+
        /*
         * Source array is made up of key values that will be used to locate the
         * tuple of interest from the local system.
@@ -2442,3 +2473,28 @@ escape_param_str(const char *str)
 
        return buf->data;
 }
+
+static int
+get_nondropped_natts(Oid relid)
+{
+       int                     nondropped_natts = 0;
+       TupleDesc       tupdesc;
+       Relation        rel;
+       int                     natts;
+       int                     i;
+
+       rel = relation_open(relid, AccessShareLock);
+       tupdesc = rel->rd_att;
+       natts = tupdesc->natts;
+
+       for (i = 0; i < natts; i++)
+       {
+               if (tupdesc->attrs[i]->attisdropped)
+                       continue;
+               nondropped_natts++;
+       }
+
+       relation_close(rel, AccessShareLock);
+       return nondropped_natts;
+}
+

diff --git a/contrib/dblink/expected/dblink.out b/contrib/dblink/expected/dblink.out
index d39aa45373ae31021a263327cf0d03d772bb4956..7aa8cc8b0dc4a9c3db4d995381f65748409e44c4 100644 (file)
--- a/contrib/dblink/expected/dblink.out
+++ b/contrib/dblink/expected/dblink.out
@@ -39,6 +39,9 @@ SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
  INSERT INTO foo(f1,f2,f3) VALUES('99','xyz','{a0,b0,c0}')
 (1 row)
 
+-- too many pk fields, should fail
+SELECT dblink_build_sql_insert('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
+ERROR:  number of primary key fields exceeds number of specified relation attributes
 -- build an update statement based on a local tuple,
 -- replacing the primary key values with new ones
 SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
@@ -47,6 +50,9 @@ SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
  UPDATE foo SET f1 = '99', f2 = 'xyz', f3 = '{a0,b0,c0}' WHERE f1 = '99' AND f2 = 'xyz'
 (1 row)
 
+-- too many pk fields, should fail
+SELECT dblink_build_sql_update('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
+ERROR:  number of primary key fields exceeds number of specified relation attributes
 -- build a delete statement based on a local tuple,
 SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
            dblink_build_sql_delete           
@@ -54,6 +60,9 @@ SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
  DELETE FROM foo WHERE f1 = '0' AND f2 = 'a'
 (1 row)
 
+-- too many pk fields, should fail
+SELECT dblink_build_sql_delete('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}');
+ERROR:  number of primary key fields exceeds number of specified relation attributes
 -- retest using a quoted and schema qualified table
 CREATE SCHEMA "MySchema";
 CREATE TABLE "MySchema"."Foo"(f1 int, f2 text, f3 text[], primary key (f1,f2));

diff --git a/contrib/dblink/sql/dblink.sql b/contrib/dblink/sql/dblink.sql
index d0ad87695a76bb2df79124244c14a6c0d0bf8b5b..dd68239d3f9ea22d7c2d5a8f4c4e2a68e7ee7de6 100644 (file)
--- a/contrib/dblink/sql/dblink.sql
+++ b/contrib/dblink/sql/dblink.sql
@@ -34,13 +34,19 @@ FROM dblink_get_pkey('foo');
 -- build an insert statement based on a local tuple,
 -- replacing the primary key values with new ones
 SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_insert('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
 
 -- build an update statement based on a local tuple,
 -- replacing the primary key values with new ones
 SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_update('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
 
 -- build a delete statement based on a local tuple,
 SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_delete('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}');
 
 -- retest using a quoted and schema qualified table
 CREATE SCHEMA "MySchema";