fix #38173 (Freeing nested cursors causes OCI8 to segfault)

diff --git a/ext/oci8/oci8_interface.c b/ext/oci8/oci8_interface.c
index 3ce60ff05c587ae4da4905ad87d5c132f82d050d..c306a7345f1f5d84ef0fd8e48a0d6f2ec47246bc 100644 (file)
--- a/ext/oci8/oci8_interface.c
+++ b/ext/oci8/oci8_interface.c
@@ -1479,7 +1479,10 @@ PHP_FUNCTION(oci_free_statement)
        }
 
        PHP_OCI_ZVAL_TO_STATEMENT(z_statement, statement);
-       zend_list_delete(statement->id);
+       if (!statement->nested) {
+               /* nested cursors cannot be freed, they are allocated once and used during the fetch */
+               zend_list_delete(statement->id);
+       }
        
        RETURN_TRUE;
 }

diff --git a/ext/oci8/oci8_statement.c b/ext/oci8/oci8_statement.c
index 16a2b7e1822b68713ee0a6f6d2c9be488d93dcd3..32cf84d913e583f88040ab806fb002f14c56b35c 100644 (file)
--- a/ext/oci8/oci8_statement.c
+++ b/ext/oci8/oci8_statement.c
@@ -94,6 +94,7 @@ php_oci_statement *php_oci_statement_create (php_oci_connection *connection, cha
 
        statement->connection = connection;
        statement->has_data = 0;
+       statement->nested = 0;
 
        if (OCI_G(default_prefetch) > 0) {
                php_oci_statement_set_prefetch(statement, OCI_G(default_prefetch) TSRMLS_CC);
@@ -443,6 +444,7 @@ int php_oci_statement_execute(php_oci_statement *statement, ub4 mode TSRMLS_DC)
                                case SQLT_RSET:
                                        outcol->statement = php_oci_statement_create(statement->connection, NULL, 0, 0 TSRMLS_CC);
                                        outcol->stmtid = outcol->statement->id;
+                                       outcol->statement->nested = 1;
 
                                        define_type = SQLT_RSET;
                                        outcol->is_cursor = 1;

diff --git a/ext/oci8/php_oci8_int.h b/ext/oci8/php_oci8_int.h
index 638cd2391a55a45e22c8de737c0a67e4d414da20..b3e2c461373ff752d649d2ca3f60c4f0d8eb30db 100644 (file)
--- a/ext/oci8/php_oci8_int.h
+++ b/ext/oci8/php_oci8_int.h
@@ -166,6 +166,7 @@ typedef struct { /* php_oci_statement {{{ */
        int ncolumns;                                   /* number of columns in the result */
        unsigned executed:1;                    /* statement executed flag */
        unsigned has_data:1;                    /* statement has more data flag */
+       unsigned nested:1;                      /* statement handle is valid */
        ub2 stmttype;                                   /* statement type */
 } php_oci_statement; /* }}} */
 

diff --git a/ext/oci8/tests/bug38173.phpt b/ext/oci8/tests/bug38173.phpt
new file mode 100644 (file)
index 0000000..b92df9e
--- /dev/null
+++ b/ext/oci8/tests/bug38173.phpt
@@ -0,0 +1,79 @@
+--TEST--
+Bug #38173 (Freeing nested cursors causes OCI8 to segfault)
+--SKIPIF--
+<?php if (!extension_loaded('oci8')) die("skip no oci8 extension"); ?>
+--FILE--
+<?php
+
+require dirname(__FILE__)."/connect.inc";
+
+$create_1 = "CREATE TABLE t1 (id INTEGER)";
+$create_2 = "CREATE TABLE t2 (id INTEGER)";
+$drop_1 = "DROP TABLE t1";
+$drop_2 = "DROP TABLE t2";
+
+$s1 = oci_parse($c, $drop_1);
+$s2 = oci_parse($c, $drop_2);
+@oci_execute($s1);
+@oci_execute($s2);
+
+$s1 = oci_parse($c, $create_1);
+$s2 = oci_parse($c, $create_2);
+oci_execute($s1);
+oci_execute($s2);
+
+for($i=0; $i < 5; $i++) {
+       $insert = "INSERT INTO t1 VALUES(".$i.")";
+       $s = oci_parse($c, $insert);
+       oci_execute($s);
+}
+
+for($i=0; $i < 5; $i++) {
+       $insert = "INSERT INTO t2 VALUES(".$i.")";
+       $s = oci_parse($c, $insert);
+       oci_execute($s);
+}
+
+$query ="
+SELECT
+  t1.*,
+  CURSOR( SELECT * FROM t2 ) as cursor
+FROM
+  t1
+";
+
+$sth = oci_parse($c, $query);
+oci_execute($sth);
+
+// dies on oci_free_statement on 2nd pass through loop
+while ( $row = oci_fetch_assoc($sth) ) {
+  print "Got row!\n";
+  var_dump(oci_execute($row['CURSOR']));
+  var_dump(oci_free_statement($row['CURSOR']));
+}
+
+$s1 = oci_parse($c, $drop_1);
+$s2 = oci_parse($c, $drop_2);
+@oci_execute($s1);
+@oci_execute($s2);
+
+echo "Done\n";
+
+?>
+--EXPECT--
+Got row!
+bool(true)
+bool(true)
+Got row!
+bool(true)
+bool(true)
+Got row!
+bool(true)
+bool(true)
+Got row!
+bool(true)
+bool(true)
+Got row!
+bool(true)
+bool(true)
+Done